Inventor
John M. Holford
Inventor
Oakton, VA, US
Overview
Patents· 5 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
F16Fprimary
F16FSprings25%
H04NPictorial communication, e.g. television17%
B63BShips or other waterborne vessels8%
B63GOffensive or defensive arrangements on vessels8%
B63HMarine propulsion or steering8%
G01SRadio direction-finding8%
G05DSystems for controlling or regulating non-electric variables8%
H01FMagnets8%
H02KDynamo-electric machines8%
PatentTitleYear
9,797,987'Correcting frequency errors in frequency difference of arrival geolocation systems'20177,418,324'Active suspension for a marine platform'20087,113,384'Dynamic degaussing system'20066,974,006'Electromagnetic active vibration control system and electromagnetic actuator'20055,708,470'Optical monitoring system apparatus'1998Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1998Patents assigned to CONDOR SYSTEMS INC (1)· patent assignee history
1998–2017Based in Oakton, VA, US· patent location history
2005–2008Patents assigned to VSSL COMMERCIAL INC (3)· patent assignee history
2017Patents assigned to ZETA ASS INC (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| VSSL COMMERCIAL INC | 3 | 2005–2008 |
| CONDOR SYSTEMS INC | 1 | 1998 |
| ZETA ASS INC | 1 | 2017 |
Locations
| Location | Patents | Span |
|---|---|---|
| Oakton, Virginia, US | 5 | 1998–2017 |