US3302330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic door operator
Assignee: Stanley Works
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Filing: 1964-05-20
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Granted: 1967-02-07
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Expires: 1984-05-20
Abstract
No abstract record available.
Inventors
- 👤 Robert M Loftus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:08
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/50; E05F15/53
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
AN AUTOMATIC DOOR OPERATOR SYSTEM COMPRISING A PEDESTRIAN RESPONSIVE SWITCH FOR OPENING AND CLOSING A FLUID VALVE, A POSITIVE DISPLACEMENT FLUID SUPPLY PUMP AND A POWER CYLINDER CONNECTED TO THE OUTPUT THEREOF WITH THE VALVE CONNECTED THEREBETWEEN, WITH THE POWER CYLINDER HAVING A POWER PISTON THEREIN, AN AUXILIARY SOURCE OF PRESSURIZED FLUID CONNECTED TO THE OUTPUT OF SAID PUMP AND OPERABLE ONLY DURING AN INTERMEDIATE PORTION OF THE POWER STROKE OF THE POWER CYLINDER TO ASSIST THE PUMP IN DELIVERING PRESSURIZED FLUID TO THE POWER CYLINDER, AND ELECTRIC CIRCUIT MEANS OPERABLE AT THE END OF EACH POWER STROKE OF THE POWER PISTON TO REPLENISH THE FLUID PRESSURE OF THE AUXILIARY FLUID SOURCE TO ITS ORIGINAL LEVEL PRIOR TO THE DEENERGIZATION OF THE FLUID PUMP.
Claim 2
Dependent Claim
124 words
AN AUTOMATIC DOOR OPERATOR SYSTEM COMPRISING A PEDESTRIAN RESPONSIVE SWITCH FOR OPENING AND CLOSING A FLUID VALVE, A POSITIVE DISPLACEMENT FLUID SUPPLY PUMP AND A POWER CYLINDER CONNECTED TO THE OUTPUT THEREOF WITH THE VALVE CONNECTED THEREBETWEEN, WITH THE POWER CYLINDER HAVING A POWER PISTON THEREIN, AN AUXILIARY SOURCE OF PRESSURIZED FLUID CONNECTED TO THE OUTPUT OF SAID PUMP AND OPERABLE ONLY DURING AN INTERMEDIATE PORTION OF THE POWER STROKE OF THE POWER CYLINDER TO ASSIST THE PUMP IN DELIVERING PRESSURIZED FLUID TO THE POWER CYLINDER, AND ELECTRIC CIRCUIT MEANS OPERABLE AT THE END OF EACH POWER STROKE OF THE POWER PISTON TO REPLENISH THE FLUID PRESSURE OF THE AUXILIARY FLUID SOURCE TO ITS ORIGINAL LEVEL PRIOR TO THE DEENERGIZATION OF THE FLUID PUMP.
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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |