Inventor
David Frank Whitehead
Inventor
Romford, GB
Overview
Patents· 8 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E05Bprimary
E05BLocks21%
Y10TTechnical subjects covered by former us classification17%
E05CBolts or fastening devices for wings, specially for doors or windows13%
H02HEmergency protective circuit arrangements13%
H02JElectric power networks13%
Y02EReduction of greenhouse gas [ghg] emissions, related to energy generation, transmission or distribution8%
A47FSpecial furniture, fittings, or accessories for shops, storehouses, bars, restaurants or the like4%
G08BSignalling systems, e.g. personal calling systems4%
Y04SSystems integrating technologies related to power network operation, communication or information technologies for improving the electrical power generation, transmission, distribution, management or usage, i.e. smart grids4%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests4%
PatentTitleYear
11,050,234Integration of primary protection relays for electric power delivery systems202111,038,336Redundant power module and discharge circuit for improved substation device availability202110,951,057Reliable power module for improved substation device availability20218,016,147'Lockable container with improved slide latch and lock'20117,837,051'Method of locking a container for prerecorded storage media'20106,926,164'Lockable container for prerecorded storage media'20055,882,052'Sliding rail latch mechanism'19995,147,034'Sliding rail latch mechanism'1992Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1992Patents assigned to BROADHEAD ROBERT M (1)· patent assignee history
1992–2011Based in Romford, GB· patent location history
1999Patents assigned to BROADHEAD ROBERT MALCOLM (1)· patent assignee history
2005Patents assigned to 5 147 034 LLC (1)· patent assignee history
2010–2011Patents assigned to CHECKPOINT SYSTEMS INC (2)· patent assignee history
2021Patents assigned to SCHWEITZER ENGINEERING LAB INC (3)· patent assignee history
2021Based in Pullman, WA, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SCHWEITZER ENGINEERING LAB INC | 3 | 2021 |
| CHECKPOINT SYSTEMS INC | 2 | 2010–2011 |
| 5 147 034 LLC | 1 | 2005 |
| BROADHEAD ROBERT M | 1 | 1992 |
| BROADHEAD ROBERT MALCOLM | 1 | 1999 |
Locations
| Location | Patents | Span |
|---|---|---|
| Romford, GB | 5 | 1992–2011 |
| Pullman, Washington, US | 3 | 2021 |