Inventor
John W. Robertson, Jr.
Inventor
Chesterland, OH, US
Overview
Patents· 13 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
B02Cprimary
B02CCrushing, pulverising, or disintegrating in general7%
H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems7%
H04QSelecting7%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests7%
B01JChemical or physical processes, e.g. catalysis or colloid chemistry3%
B60PVehicles adapted for load transportation or to transport, to carry, or to comprise special loads or objects3%
B63BShips or other waterborne vessels3%
E05CBolts or fastening devices for wings, specially for doors or windows3%
E05DHinges or suspension devices for doors, windows or wings3%
E05FDevices for moving wings into open or closed position3%
PatentTitleYear
10,271,452Features for cable managers and other electronic equipment structures20199,815,527'Marine lift for multi-hull vessels'2017D0554228'Dragonfly fishing lure'20074,875,000'Current fault detection system and method for AC controller'19894,852,384'Automatic calibration and control system for a combined oxygen and combustibles analyzer'19894,846,410'Apparatus for monitoring low-level combustibles'19894,778,113'Apparatus for monitoring low level combustibles'19884,703,407'Power supply for totem pole power switches'19874,692,933'Electro-mechanical integrator'19874,655,074'Self-zeroing pressure transmitter with automatic pressure manifold'19874,599,550'Digital generation of 3-phase PWM waveforms for variable speed control of induction motor'19864,583,029'Variable speed resistive network for a pneumatic servo assembly of an electro-pneumatic converter'19864,456,865'High torque servo positioner using 3 phase variable frequency constant torque controller'1984Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1984–1989Patents assigned to BABCOCK & WILCOX CO (10)· patent assignee history
1984–1986Based in Willowick, OH, US· patent location history
1986–1989Based in Chesterland, OH, US· patent location history
2007Patents assigned to ROBERTSON JOHN W (1)· patent assignee history
2007Based in Sparta, WI, US· patent location history
2017Patents assigned to ROBERTSON & CAINE (PTY) LTD (1)· patent assignee history
2017Based in Indian Rocks Beach, FL, US· patent location history
2019Patents assigned to CHATSWORTH PROD INC (1)· patent assignee history
2019Based in Georgetown, TX, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| BABCOCK & WILCOX CO | 10 | 1984–1989 |
| CHATSWORTH PROD INC | 1 | 2019 |
| ROBERTSON & CAINE (PTY) LTD | 1 | 2017 |
| ROBERTSON JOHN Wself | 1 | 2007 |
Locations
| Location | Patents | Span |
|---|---|---|
| Chesterland, OH, US | 7 | 1986–1989 |
| Willowick, OH, US | 2 | 1984–1986 |
| Georgetown, Texas, US | 1 | 2019 |
| Indian Rocks Beach, Florida, US | 1 | 2017 |
| Sparta, WI, US | 1 | 2007 |