Patent US3561160A successfully refreshed from Google Patents.
US3561160A
Expired / Lapsed
US
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Crew switch for controlling a door operator
Assignee: Vapor Corp
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Filing: 1969-06-24
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Granted: 1971-02-09
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Expires: 1989-06-24
Abstract
Abstract CREW SWITCH FOR A TRAIN CAR TO ENABLE OPENING AND CLOSING OF AN INDIVIDUAL DOOR FROM EITHER A KEY OPERATED STATION LOCATED OUTSIDE THE CAR OR A KEY OPERATED STATION LOCATED INSIDE THE CAR, AND CLOSING OF A DOOR BY THE MASTER DOOR CONTROL FOLLOWING OPENING OF THAT DOOR AT A REMOTE KEY OPERATED STATION, WHEREIN A RELAY ACTUATED SWITCHING CIRCUIT IS PROVIDED.
Inventors
- 👤 William Chan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:39
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05F15/632; E05F15/655; 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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |