US3210065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic door opener
Assignee: Crown Industries Inc
•
Filing: 1962-10-17
•
Granted: 1965-10-05
•
Expires: 1982-10-17
Abstract
No abstract record available.
Inventors
- 👤 Josef M Linder
- 👤 Raymond H Boehm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:48
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/50; E05F15/53
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN A FLUID PRESSURE ACTUATED DOOR OPERATOR, A CASING ADAPTED TO SERVE AS THE LINTEL PORTION OF A DOOR FRAME, A CLUTCH MOUNTED IN THE CASING FOR OSCILLATION AND PROVIDED WITH MEANS TO ENGAGE AND OSCILLATE A DOOR, A CYLINDER SLIDABLY MOUNTED IN THE CASING AND HAVING A POWER CHAMBER THEREIN, A POWER PISTON MOVABLE IN THE CYLINDER, A ROD PIVOTALLY CONNECTING THE CYLINDER WITH ONE SIDE OF THE CLUTCH, A ROD PIVOTALLY CONNECTING THE POWER PISTON WITH THE OTHER SIDE OF THE CLUTCH, THE TWO RODS EXERTING BALANCED PUSH AND PULL ON THE CLUTCH FOR OSCILLATION THEREOF SUBSTANTIALLY WITHOUT SIDE THRUST, FLUID PRESSURE IN THE POWER CHAMBER MOVING BOTH THE CYLINDER AND THE POWER PISTON FOR OSCILLATION OF THE CLUTCH.
Claim 2
Dependent Claim
121 words
IN A FLUID PRESSURE ACTUATED DOOR OPERATOR, A CASING ADAPTED TO SERVE AS THE LINTEL PORTION OF A DOOR FRAME, A CLUTCH MOUNTED IN THE CASING FOR OSCILLATION AND PROVIDED WITH MEANS TO ENGAGE AND OSCILLATE A DOOR, A CYLINDER SLIDABLY MOUNTED IN THE CASING AND HAVING A POWER CHAMBER THEREIN, A POWER PISTON MOVABLE IN THE CYLINDER, A ROD PIVOTALLY CONNECTING THE CYLINDER WITH ONE SIDE OF THE CLUTCH, A ROD PIVOTALLY CONNECTING THE POWER PISTON WITH THE OTHER SIDE OF THE CLUTCH, THE TWO RODS EXERTING BALANCED PUSH AND PULL ON THE CLUTCH FOR OSCILLATION THEREOF SUBSTANTIALLY WITHOUT SIDE THRUST, FLUID PRESSURE IN THE POWER CHAMBER MOVING BOTH THE CYLINDER AND THE POWER PISTON FOR OSCILLATION OF THE CLUTCH.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |