U.S. Patent No. 11,374,508
`Search Disclosure Declaration
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`UNITED STATES PATENT AND TRADEMARK OFFICE
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`BEFORE THE PATENT TRIAL AND APPEAL BOARD
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`TOYOTA MOTOR CORPORATION,
`Petitioner,
`V.
`BUNKER HILL TECHNOLOGIES, LLC
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`Patent Owner
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`Case No.: [PR2026-00333
`U.S. Patent No. 11,374,508
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`SEARCH DISCLOSURE DECLARATION
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`U.S. Patent No. 11,374,508
`Search Disclosure Declaration
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`The Petition for Inter Partes Review cites six references in its grounds:
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`1. JP2010-036880 (“Tsuzuki’)
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`2. JP2010-221979 (“Imai”)
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`3. U.S. Patent No. 8,618,752 (“Zing”)
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`4. US2006/0098390 (““Ashtiani’)
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`5. JP2001-218380 (“Satoru™)
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`6. US2014/0100726 (“Reynolds™)
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`7. Collectively, those six references are the asserted prior art.
`Per the November 17, 2025 memorandum, and without waiving the attorney-client
`privilege, attorney work product protection, or any other applicable privilege or
`protection, Petitioner provides the information for where the asserted prior art was
`located:
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`a. Database and repositories in which the asserted prior art was located: The
`Tsuzuki, Imai, and Reynolds references were located using Petitioner’s
`internal repository. The Ashtiani, Satoru, and Zing references were located
`by Global Prior Art, a third-party search service. For further details on Global
`Prior Art’s search, please see Exhibit A hereto.
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`b. General search approach, search terms, filters, queries or classification
`pathways employed: Petitioner had its own personnel conduct the search for
`relevant prior art from Petitioner’s internal repository. This internal search
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`involved using search terms from the automobile industry as it relates to the
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`U.S. Patent No. 11,374,508
`Search Disclosure Declaration
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`99 ¢¢
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`subject matter of the challenged claims, e.g., “motor,” “generator,” and
`“M/G.” For further details on Global Prior Art’s search, please see Exhibit A
`hereto.
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`c. Other analytics or publicly accessible resources consulted: None
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`d. The amount of time spent on the search: Approximately 25-30 hours
`internally. In addition, Global Prior Art spent approximately 40 hours on its
`search. See Exhibit A.
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`e. The amount of time spent reviewing search results from the search:
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`Approximately 25-30 hours.
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`Respectfully submitted,
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`Date: April 7, 2026 /s/ Alexander Englehart
`Alexander B. Englehart
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`Counsel for Petitioner
`Registration No. 62,031
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`EXHIBIT A
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`rTT TN
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`AN
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`BOSTON
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`GLOBAL PRIOR ART INC.
`} S 21 Milk Street, 6™ Floor, Boston, MA 02109
`Telephone: 617-574-9574
`TOKYO Telefax: 617-574-9559
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`U.S. and Rest-of-World Patent Coverage for Targeted Invalidity Search to Bunker Hill
`Technologies LLC’s U.S. Patent 11,374,508 Titled “Electric Drive System and Energy
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`Management Method”
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`Priority Date: December 3, 2012
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`CPC / IPC Classes Targeted During Manual Patent Review
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`CPC /IPC Class | Description
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`B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES
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`B60L50/00 Electric propulsion with power supplied within the vehicle
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`B60L50/50 . using propulsion power supplied by batteries or fuel cells
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`B60L50/51 .. characterised by AC-motors
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`B60L50/52 .. characterised by DC-motors
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`B60L50/75 .. using propulsion power supplied by both fuel cells and batteries
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`B60L15/00 Methods, circuits, or devices for controlling the traction-motor speed of
`electrically-propelled vehicles
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`B60L15/20 . for control of the vehicle or its driving motor to achieve a desired
`performance, e.g. speed, torque, programmed variation of speed
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`B60L15/2027 .... whilst maintaining constant speed
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`B60L15/2045 .. for optimising the use of energy
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`B60L15/2063 .. for creeping
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`B60L15/2072 .. for drive off
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`B60L15/32 . Control or regulation of multiple-unit electrically-propelled vehicles
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`B60L 7/00 Electrodynamic brake systems for vehicles in general
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`B60L7/18 .. Controlling the braking effect
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`HO02J ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR
`SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC
`POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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`H02J7/02 . for charging batteries from AC mains by converters
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`YO02T CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO
`TRANSPORTATION
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`Y02T10/64 .. Electric machine technologies in electromobility
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`Y02T10/70 .. Energy storage systems for electromobility, e.g. batteries
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`Total Time Spent on Search
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`o 40 hours
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`Databases Used
`o PatSnap (patent database provider used to manually cover the full text and figures of
`patent documents)
`o Google Patents
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`Keywords Used:
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`Battery / capacitor / cell / energy / accumulator
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`“Electric motor™/ “electric propulsion”/ “electrically propelled”
`Start / stationary/ “ignition on”
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`Motor / motors / drive
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`Two / plural / dual / pair
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`Ultracapacitor / “ultra capacitor” / supercapacitor / “super capacitor”
`Mode / function / operation
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`O O 0 O 0o O O
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`(The keyword strings used during the broader search are typically tailored to the larger classes
`and publications under review, and also evolve in an iterative manner as new terms are added as
`the search progresses and the varied terminology is studied.)
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`Companies and Inventors Targeted
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`Inventors
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`o Atsushi Tabata
`Yutaka Tuga
`Roland A. Holland
`Mark E. Wagner
`Mark A. Anderson
`Takeshi Kitahata
`Kozo Yamaguchi
`Peter Nysen
`Companies / Institutions
`Toyota
`Honda
`EV-IP
`BMW
`Ford
`Hyundai
`Atieva, Inc.
`General Motors
`Maxwell Technologies
`Johnson Controls
`Daimler Chrysler
`Panasonic
`Peugeot Citroen Automobiles
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`O O 0 0O 0O O O
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`O 0O 0O O o 0o O o o O o0 o
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