Peter is highly experienced at EPO Opposition and Appeal proceedings, having been lead attorney in a large number of cases over the past fifteen years. Peter has frequently represented his clients in person at the European Patent Office in Munich and the Hague, and in recent years he has handled numerous oral proceedings by video conference from Quayside IP’s dedicated videoconferencing facility.
Peter has successfully defended patents from attack by multiple opponents, and has collaborated with co-opponents as well as operating as sole opponent on many occasions. Peter has faced a myriad of situations with every case bringing unique challenges, for example: dealing with new evidence filed shortly before oral proceedings; navigating adjournments in oral proceedings and the ensuing issues; cases involving prior use and the hearing of expert witnesses; taking on cases part-way through an opposition or at the appeal stage and redirecting strategies to achieve a successful outcome; working in different languages and with live translation; cases involving parallel national infringement proceedings and interventions during EPO appeals; achieving awards of costs from the Opposition Division and Boards of Appeal; and achieving revocation of a mechanical patent by the Boards of Appeal based on the ground of insufficiency.
Peter regularly works on appeal cases and has a deep understanding of the Rules of Procedure and evolving case law. He ensures that his cases and request strategies are optimised for the appeal process from the outset of the opposition procedure.
Peter has an enviable record of success, which is presented below in comparison to the EPO’s average outcomes based upon published statistics.
Opponent in Opposition
When representing the opponent in opposition proceedings before the EPO Opposition Division, 35% of patents have been revoked, 51% have been maintained in amended form, and 14% maintained as granted. This compares favourably with the EPO’s averages in Mechanical Engineering, which are 28% revoked, 37% maintained in amended form, and 35% maintained as granted*.
*EPO averages are taken from EPO Statistics 2020, CA/F 5/21
List of cases handled by Peter Kent in opposition proceedings as representative for the opponent (updated February 2025)
1 EP1295032
BLADE OF A WIND TURBINE
Stichting Energieonderzoek Centrum Nederland
Opposition rejected
(Patent Revoked in Appeal), November 2012
2 EP2093043
DETECTING LEAK IN A VARTM PROCESS
LM GLASFIBER A/S
Patent Maintained in Amended Form
December 2013
3 EP2004989
WIND TURBINE ROTOR BLADE
Siemens Aktiengesellschaft
Patent Maintained in Amended Form
(Patent Revoked in Appeal), January 2014
4 EP2357069
MANUFACTURING A COMPOSITE PART INCLUDING AT LEAST ONE FIBRE REINFORCED MATRIX
Siemens Gamesa Renewable Energy A/S
Patent Maintained in Amended Form
(Patent Revoked in Appeal)
November 2015
5 EP2295235
FIBER REINFORCED PLASTIC-STRUCTURE
Siemens Aktiengesellschaft
Patent Revoked
March 2016
6 EP2181834
METHOD FOR MANUFACTURING A ROTOR BLADE SPAR CAP
Senvion GmbH
Patent Maintained in Amended Form
April 2016
7 EP1925436
FIBRE REINFORCED LAMINATE
Siemens Gamesa Renewable Energy A/S
Patent Revoked
April 2016
8 EP1944505
WIND TURBINE ROTOR BLADE WITH VORTEX GENERATORS
Siemens Aktiengesellschaft
Patent Revoked
May 2016
9 EP1485610
TRANSITION ZONE IN WIND TURBINE BLADE
LM GLASFIBER A/S
Patent Maintained in Amended Form
(Patent Revoked in Appeal), February 2017
10 EP2022979
BLADE WITH DIVERGENT TRAILING EDGE
Gamesa Innovation & Technology, S.L.
Patent Revoked
December 2017
11 EP2524134
WIND TURBINE ROTOR BLADE COMPONENTS
Siemens Gamesa Renewable Energy Service GmbH
Patent Revoked
March 2018
12 EP2333319
A FLUID TURBINE BLADE
General Electric Company
Patent Revoked
April 2018
13 EP2761170
WIND TURBINE BLADE HAVING A GEOMETRIC SWEEP
Siemens Aktiengesellschaft
Patent Revoked
October 2018
14 EP2078852
WIND TURBINE ROTOR BLADE
Siemens Gamesa Renewable Energy A/S
Patent Maintained in Amended Form
November 2018
15 EP2492496
ROTOR BLADE WITH VARYING BLADE DEPTH
Nordex Energy GmbH
Patent Maintained in Amended Form
(Patent Revoked in Appeal), November 2018
16 EP2589796
MANUFACTURE OF A ROOT SECTION
Siemens Gamesa Renewable Energy A/S
Patent Maintained in Amended Form
(Patent Revoked in Appeal, December 2018
17 EP2497945
REINFORCEMENT FOR A LARGE WIND-TURBINE BLADE
Epsilon Composite
Patent Maintained in Amended Form
(Patent Revoked in Appeal), April 2019
18 EP2799710
ROTOR BLADE ASSEMBLY HAVING VORTEX GENERATORS
General Electric Company
Patent Revoked
April 2019
19 EP2901010
A WIND TURBINE BLADE WITH AN ELASTIC DEFORMABLE TRAILING EDGE
Blade Dynamics Limited
Opposition Rejected
(Patent Revoked in Appeal)
October 2019
20 EP2591230
WIND TURBINE BLADE
Blade Dynamics Limited
Patent Maintained in Amended Form
November 2019
21 EP2867523
A WIND TURBINE BLADE WITH A NOISE REDUCING DEVICE
Siemens Gamesa Renewable Energy A/S
Patent Revoked
November 2019
23 EP2877337
A FEEDBACK SYSTEM FOR CONTROLLING RESIN FLOW RATE
LM Wind Power A/S
Patent Maintained in Amended Form
December 2019
24 EP2736805
WIND TURBINE BLADE COMPRISING VORTEX GENERATORS
LM WP Patent Holding A/S
Patent Maintained in Amended Form
March 2020
25 EP2836702
WIND TURBINE BLADE
Wobben Properties GmbH
Patent Maintained in Amended Form
(Patent Revoked in Appeal), April 2020
26 EP2479423
WIND TURBINE ROTOR BLADE ELEMENT
Siemens Gamesa Renewable Energy A/S
Patent Maintained in Amended Form
(Patent Revoked in Appeal), November 2020
27 EP3018342
METHOD FOR PRODUCING A ROTOR BLADE OF A WIND TURBINE
Siemens Gamesa Renewable Energy Service GmbH
Patent Maintained in Amended Form, May 2021
28 EP3034865
ASSEMBLY OF PULTRUDED RODS
Siemens Gamesa Renewable Energy Service GmbH
Patent Revoked
June 2021
29 EP1925818
WIND TURBINE ROTOR WITH BULKHEAD
Siemens Gamesa Renewable Energy Service GmbH
Opposition Rejected
July 2021
31 EP2273102
WIND TURBINE BLADE REPAIR
General Electric Company
Patent Revoked
December 2021
32 EP3093485
A WIND TURBINE BLADE
Blade Dynamics Limited
Opposition Rejected
(Patent Revoked in Appeal), January 2022
33 EP3155258
A TIP SYSTEM FOR A WIND TURBINE BLADE
LM Wind Power A/S
Patent Revoked
June 2022
34 EP2752577
WIND TURBINE ROTOR BLADE COMPONENTS
Siemens Gamesa Renewable Energy Service GmbH
Patent Revoked
September 2022
35 EP3486476
SHEAR WEB FOR A ROTOR BLADE OF A WIND TURBINE
Siemens Gamesa Renewable Energy Service GmbH
Opposition Rejected
February 2023
36 EP3418556
A WIND TURBINE BLADE WITH HYBRID SPAR CAP
General Electric Company
Patent Maintained in Amended Form
(Patent Revoked in Appeal), March 2023
37 EP2543875
MANUFACTURING WIND TURBINE BLADES OF DIFFERENT LENGTHS
SIEMENS GAMESA RENEWABLE ENERGY INNOVATION & TECHNOLOGY, S.L.
Patent Maintained in Amended Form, March 2024
38 EP3696402
NOISE REDUCER FOR A WIND TURBINE ROTOR BLADE
LM Wind Power A/S
Patent Maintained in Amended Form
July 2024
39 EP2659133
WIND TURBINE BLADE WITH CROSS-SECTIONAL SENSORS
LM WP Patent Holding A/S
Patent Maintained in Amended Form
July 2024
Proprietor in Opposition
When representing the patent proprietor in opposition proceedings before the EPO Opposition Division, 0% of patents have been revoked, 67% have been maintained in amended form, and 33% maintained as granted. This compares favourably with the EPO’s averages in Mechanical Engineering, which are 28% revoked, 37% maintained in amended form, and 35% maintained as granted*.
*EPO averages are taken from EPO Statistics 2020, CA/F 5/21
List of cases handled by Peter Kent in opposition proceedings as representative for the patent proprietor (updated February 2025)
1 EP2217748
STRUCTURAL MAT FOR REINFORCING A WIND TURBINE BLADE STRUCTURE
Vestas Wind Systems A/S
Opposition rejected, November 2015
2 EP2027390
A WIND TURBINE BLADE
Vestas Wind Systems A/S
Patent Maintained in Amended Form
May 2016
3 EP1907692
A WIND TURBINE PITCH BEARING
Vestas Wind Systems A/S
Patent Maintained in Amended Form
October 2018
4 EP2523798
JOINING METHOD OF COMPOSITE PARTS HAVING A THERMOSET MATRIX
Vestas Wind Systems A/S
Opposition rejected, July 2019
5 EP2791500
WIND TURBINE BLADE AND PRODUCTION METHOD
Vestas Wind Systems A/S
Patent Maintained in Amended Form
November 2021
6 EP3491242
WIND TURBINE BLADE HAVING A LIGHTNING TIP RECEPTOR
Vestas Wind Systems A/S
Patent Maintained in Amended Form
April 2023
7 EP3253965
WIND TURBINE ACCESS PANEL
Vestas Wind Systems A/S
Opposition rejected
May 2023
8 EP3058221
LIGHTNING PROTECTION SYSTEMS FOR
WIND TURBINE BLADES
Vestas Wind Systems A/S
Patent Maintained in Amended Form, July 2023
9 EP3161307
WIND TURBINE BLADE MANUFACTURE
Vestas Wind Systems A/S
Patent Maintained in Amended Form
December 2023
10 EP3505751
WIND TURBINE BLADE
Vestas Wind Systems A/S
Patent Maintained in Amended Form
August 2024
11 EP3803106
MODULAR WIND TURBINE BLADE
Vestas Wind Systems A/S
Opposition rejected
October 2024
12 EP3606731
WIND TURBINE BLADE MANUFACTURE
Vestas Wind Systems A/S
Patent Maintained in Amended Form
January 2025
Opponent-Appellant in Appeal
When representing the opponent in appeal proceedings before the EPO Boards of Appeal, 82% of patents have been revoked, 14% have been maintained in amended form, and 4% maintained as granted. This compares favourably with the EPO’s averages, which are 50% revoked, 41% maintained in amended form, and 9% maintained as granted*.
*EPO averages are based on 2021 data taken from the Annual report of the Boards of Appeal 2021
List of cases handled by Peter Kent in appeal proceedings as representative for the opponent-appellant (updated February 2025)
1 T0059/13-3.2.04 EP1295032
BLADE OF A WIND TURBINE
Stichting Energieonderzoek Centrum Nederland
Patent Revoked
April 2017
2 T0352/14-3.2.05 EP2093043
DETECTING LEAK IN A VARTM PROCESS
LM GLASFIBER A/S
Patent Maintained in Amended Form
November 2018
3 T0455/14-3.2.04 EP2004989
WIND TURBINE ROTOR BLADE
Siemens Aktiengesellschaft
Patent Revoked
November 2018
4 T0993/17-3.2.04 EP1485610
TRANSITION ZONE IN WIND TURBINE BLADE
LM GLASFIBER A/S
Patent Revoked
February 2021
5 T0185/16-3.2.05 EP2357069
MANUFACTURING A COMPOSITE PART INCLUDING AT LEAST ONE FIBRE REINFORCED MATRIX
Siemens Gamesa Renewable Energy A/S
Patent Revoked, April 2021
6 T1391/16-3.2.05 EP1925436
FIBRE REINFORCED LAMINATE
Siemens Gamesa Renewable Energy A/S
Patent Revoked
August 2021
7 T0923/18-3.2.04 EP2524134
WIND TURBINE ROTOR BLADE COMPONENTS
Siemens Gamesa Renewable Energy Service GmbH
Patent Revoked
October 2021
8 T0198/19-3.2.04 EP2492496
ROTOR BLADE WITH VARYING BLADE DEPTH
Nordex Energy GmbH
Patent Revoked
January 2022
9 T3222/19-3.2.04 EP2867523
A WIND TURBINE BLADE WITH A NOISE REDUCING DEVICE
Siemens Gamesa Renewable Energy A/S
Patent Revoked
March 2022
10 T0409/19-3.2.05 EP2589796
MANUFACTURE OF A ROOT SECTION
Siemens Gamesa Renewable Energy A/S
Patent Revoked
May 2022
11 T1997/20-3.2.04 EP2479423
WIND TURBINE ROTOR BLADE ELEMENT
Siemens Gamesa Renewable Energy A/S
Patent Revoked
June 2022
12 T1790/19-3.2.04 EP2497945
REINFORCEMENT FOR A LARGE WIND-TURBINE BLADE
Epsilon Composite
Patent Revoked
September 2022
13 T3223/19-3.2.04 EP2901010
A WIND TURBINE BLADE WITH AN ELASTIC DEFORMABLE TRAILING EDGE
Blade Dynamics Limited
Patent Revoked, October 2022
14 T1304/20-3.2.04 EP2836702
WIND TURBINE BLADE
Wobben Properties GmbH
Patent Revoked
April 2023
15 T0978/20-3.2.04 EP2736805
WIND TURBINE BLADE COMPRISING VORTEX GENERATORS
LM WP Patent Holding A/S
Patent Maintained as granted
April 2023
16 T0966/21-3.2.04 EP3018342
METHOD FOR PRODUCING A ROTOR BLADE OF A WIND TURBINE
Siemens Gamesa Renewable Energy Service GmbH
Patent Maintained in Amended Form, September 2023
17 T2108/21-3.2.04 EP2828521
WINGLET FOR A WIND TURBINE ROTOR BLADE
General Electric Company
Patent Revoked
20 September 2023
18 T1583/21-3.2.04 EP1925818
WIND TURBINE ROTOR WITH BULKHEAD
Siemens Gamesa Renewable Energy Service GmbH
Opposition Rejected
September 2023
19 T0312/22-3.2.04 EP3093485
A WIND TURBINE BLADE
Blade Dynamics Limited
Patent Revoked
December 2023
20 T2295/22-3.2.04 EP2273102
WIND TURBINE BLADE REPAIR
General Electric Company
Patent Revoked
April 2024
21 T1954/22-3.2.04 EP3155258
A TIP SYSTEM FOR A WIND TURBINE BLADE
LM Wind Power A/S
Patent Revoked
April 2024
22 T0767/23-3.2.04 EP3418556
A WIND TURBINE BLADE WITH HYBRID SPAR CAP
General Electric Company
Patent Revoked
November 2024
Proprietor-Appellant in Appeal
When representing the patent proprietor in opposition-appeal proceedings before the EPO Boards of Appeal, 20% of patents have been revoked, 40% have been maintained in amended form, and 40% maintained as granted. This compares favourably with the EPO’s averages, which are 50% revoked, 41% maintained in amended form, and 9% maintained as granted*.
*EPO averages are based on 2021 data taken from the Annual report of the Boards of Appeal 2021
List of cases handled by Peter Kent in appeal proceedings as representative for the proprietor-appellant (updated February 2025)
1 T1644/16-3.2.04 EP2027390
A WIND TURBINE BLADE
Vestas Wind Systems A/S
Patent Maintained in Amended Form, June 2020
2 T0095/16-3.2.06 EP2217748
STRUCTURAL MAT FOR REINFORCING A WIND TURBINE BLADE STRUCTURE
Vestas Wind Systems A/S
Opposition Rejected, September 2021
3 T0035/19-3.2.08 EP1907692
A WIND TURBINE PITCH BEARING
Vestas Wind Systems A/S
Patent Maintained in Amended Form
March 2022
4 T0039/22-3.2.04 EP2791500
WIND TURBINE BLADE AND PRODUCTION METHOD
Vestas Wind Systems A/S
Patent Revoked, November 2023
5 T0772/23-3.2.04 EP3491242
WIND TURBINE BLADE HAVING A LIGHTNING TIP RECEPTOR
Vestas Wind Systems A/S
Opposition Rejected, 20 December 2024