Patent US3323255A successfully refreshed from Google Patents.
US3323255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door actuating mechanism
Assignee: SWEETLAND ENGINEERING Co
•
Filing: 1965-02-24
•
Granted: 1967-06-06
•
Expires: 1985-02-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Ernest J Sweetland
- 👤 John P Oakley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:06
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
142 words
A DOOR CONTROLLING MECHANISM COMPRISING: FIRST AND SECOND HYDRAULIC CYLINDERS EACH HAVING A DRIVE PISTON; DRIVE MEANS INTERCONNECTING SAID PISTONS IN A PUSH-PULL RELATIONSHIP; MEANS TO ATTACH SAID DRIVE MEANS TO A DOOR AND CAUSE SAID DOOR TO OPEN WHEN SAID DRIVE MEANS IS MOVED IN ONE DIRECTION AND CAUSE THE DOOR TO CLOSE WHEN THE DRIVE MEANS IS MOVED IN THE OPPOSITE DIRECTION; A REVERSIBLE HYDRAULIC PUMP CONNECTED TO SUPPLY HYDRAULIC FLUID UNDER PRESSURE AND, ALTERNATELY, DRAW HYDRAULIC FLUID FROM ONE OF SAID HYDRAULIC CYLINDERS AND FORCE SAID FLUID INTO THE OTHER OF THE CYLINDERS TO DRIVE SAID PISTONS IN PUSH-PULL RELATIONSHIP IN ACCORDANCE WITH THE DIRECTION OF MOVEMENT OF THE HYDRAULIC PUMP; SWITCH MEANS MOUNTED ADJACENT TO SAID DOOR; PUMP DRIVE MEANS CONNECTED IN CONTROLLED RELATION TO SAID SWITCH MEANS TO CAUSE SAID HYDRAULIC PUMP TO OPERATE SELECTIVELY IN THE
Claim 2
Dependent Claim
142 words
A DOOR CONTROLLING MECHANISM COMPRISING: FIRST AND SECOND HYDRAULIC CYLINDERS EACH HAVING A DRIVE PISTON; DRIVE MEANS INTERCONNECTING SAID PISTONS IN A PUSH-PULL RELATIONSHIP; MEANS TO ATTACH SAID DRIVE MEANS TO A DOOR AND CAUSE SAID DOOR TO OPEN WHEN SAID DRIVE MEANS IS MOVED IN ONE DIRECTION AND CAUSE THE DOOR TO CLOSE WHEN THE DRIVE MEANS IS MOVED IN THE OPPOSITE DIRECTION; A REVERSIBLE HYDRAULIC PUMP CONNECTED TO SUPPLY HYDRAULIC FLUID UNDER PRESSURE AND, ALTERNATELY, DRAW HYDRAULIC FLUID FROM ONE OF SAID HYDRAULIC CYLINDERS AND FORCE SAID FLUID INTO THE OTHER OF THE CYLINDERS TO DRIVE SAID PISTONS IN PUSH-PULL RELATIONSHIP IN ACCORDANCE WITH THE DIRECTION OF MOVEMENT OF THE HYDRAULIC PUMP; SWITCH MEANS MOUNTED ADJACENT TO SAID DOOR; PUMP DRIVE MEANS CONNECTED IN CONTROLLED RELATION TO SAID SWITCH MEANS TO CAUSE SAID HYDRAULIC PUMP TO OPERATE SELECTIVELY IN THE
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) | 1970-06-05 | 1970-12-05 | 1971-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-05 | 1974-12-05 | 1975-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-05 | 1978-12-05 | 1979-06-06 | $7700.00 | Window Closed / Lapsed |