US3564772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prison door operating and locking mechanism
Assignee: Willo Products Co Inc
•
Filing: 1969-09-29
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Granted: 1971-02-23
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Expires: 1989-09-29
Abstract
Abstract SLIDE BAR DETACHABLY CONNECTED TO DOOR CARRIAGE AND MOVABLE TO DOOR OPEN AND CLOSED POSITIONS. CAM SURFACES AT OPPOSITE ENDS OF SLIDE BAR ENGAGE AND LOWER LOCK BAR ACTUATING MEMBER WHEN DOOR OPENED AND CLOSED AND LIFT LOCK BAR UPON INITIAL MOVEMENT OF SLIDE BAR AWAY FROM DOOR OPEN AND CLOSED POSITIONS. SLIDE BAR ACTUATOR CONNECTED TO MAIN BAR WHILE IN INTERMEDIATE POSITION AND DISCONNECTED THEREFROM WHILE IN UPPER AND LOWER POSITIONS, WITH DOOR IN FULLY OPEN OR CLOSED POSITION. SAFETY MEMBER PREVENTS MOVEMENT OF DOOR CARRIAGE WITHOUT CORRESPONDING MOVEMENT OF SLIDE BAR.
Inventors
- 👤 Melvin G Ozier
- 👤 John W Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:10
CPC Classifications
E; E05; E05F; E05F17/00; E05F17/001
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |