US3553890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power-operated door gear
Assignee: G D Peters & Co Engineering Lt
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Filing: 1968-08-12
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Granted: 1971-01-12
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Expires: 1988-08-12
Abstract
Abstract A POWER-OPERATED DOOR OPERATING GEAR IN WHICH A DOOR POSITION SENSOR APPLIES POWER TO OPEN THE DOOR OR DOORS WHEN THE FOOR IS OR DOORS ARE MOVED MANUALLY AWAY FROM THE FULLY CLOSED POSITION. THE SENSOR MAY PROVIDE A "DOOR CLOSED" SIGNAL TO A REMOTE OPERATOR, AND MAY BE INTERLOCKED WITH VEHICLE OPERATING GEAR. THE PREFERRED SENSOR COMPRISES A REED SWITCH AND A MAGNET FOR CHANGING THE STATE OF THE SWITCH WHEN THE DOOR IS FULLY CLOSED.
Inventors
- 👤 Henry Jackson Stretton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:53
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/50; E05F15/56; E05F15/565; E05Y; E05Y2900/00; E05Y2900/50; E05Y2900/51
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |