US3084927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic door operator
Assignee: Crown Industries Inc
•
Filing: 1960-02-15
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Granted: 1963-04-09
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Expires: 1980-02-15
Abstract
No abstract record available.
Inventors
- 👤 Josef M Linder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:52
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/50; E05F15/53; Y; Y10; Y10S; Y10S60/00; Y10S60/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A DOOR OPERATOR AND OPERATING SYSTEM THEREFORE TO OPEN A FRAMED DOOR BIASED TO CLOSED POSITION IN SAID FRAME AND EQUIPPED WITH A TREADLE OPERATED CONTROL SWITCH, AN HYDRAULIC OPERATED CYLINDER AND PISTON ASSEMBLY MECHANICALLY CONNECTED TO THE FRAME AND TO THE DOOR AND INCLUDING AN ARM ATTACHED TO THE DOOR FOR SWINGING MOTION RESPONSIVE TO THE POSITION OF THE PISTON IN THE CYLINDER, AN ELECTRIC CIRCUIT INCLUDING A SOURCE OF CURRENT AND SAID TREADLE SWITCH WITH A COIL OF A MAGNETICALLY RESPONSIVE MASTER VALVE; SAID VALVE HAVING A CAGE COMPRISING A PORTION OF AN HYDRAULIC SYSTEM INCLUDING SAID CYLINDER, A LIQUID FILLED RESERVOIR, A MOTORIZED PUMP, AN AIR CUSHIONED PRESSURE TANK AND HYDRAULIC CONNECTIONS BE-
Claim 2
Dependent Claim
116 words
A DOOR OPERATOR AND OPERATING SYSTEM THEREFORE TO OPEN A FRAMED DOOR BIASED TO CLOSED POSITION IN SAID FRAME AND EQUIPPED WITH A TREADLE OPERATED CONTROL SWITCH, AN HYDRAULIC OPERATED CYLINDER AND PISTON ASSEMBLY MECHANICALLY CONNECTED TO THE FRAME AND TO THE DOOR AND INCLUDING AN ARM ATTACHED TO THE DOOR FOR SWINGING MOTION RESPONSIVE TO THE POSITION OF THE PISTON IN THE CYLINDER, AN ELECTRIC CIRCUIT INCLUDING A SOURCE OF CURRENT AND SAID TREADLE SWITCH WITH A COIL OF A MAGNETICALLY RESPONSIVE MASTER VALVE; SAID VALVE HAVING A CAGE COMPRISING A PORTION OF AN HYDRAULIC SYSTEM INCLUDING SAID CYLINDER, A LIQUID FILLED RESERVOIR, A MOTORIZED PUMP, AN AIR CUSHIONED PRESSURE TANK AND HYDRAULIC CONNECTIONS BE-
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-08 | 1966-10-08 | 1967-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-08 | 1970-10-08 | 1971-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-08 | 1974-10-08 | 1975-04-09 | $7700.00 | Window Closed / Lapsed |