US3078499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door closer
Assignee: Illinois Lock Co
•
Filing: 1958-09-30
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Granted: 1963-02-26
•
Expires: 1978-09-30
Abstract
No abstract record available.
Inventors
- 👤 Raymond K Gray
- 👤 Stanley C Wolniak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:15
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/04; E05F3/10; E05F3/108; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7859; Y10T137/786
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
IN A HYDRAULIC DOOR CLOSER: A CYLINDER ADAPTED TO CONTAIN HYDRAULIC FLUID; A PISTON SLIDABLE IN SAID CYLINDER; A SPRING URGING SAID PISTON TOWARD ONE END OF SAID CYLINDER; MEANS FOR CONNECTING SAID PISTON AND CYLINDER TO A DOOR AND AN ASSOCIATED FRAME, OPENING MOVEMENT OF SAID DOOR MOVING SAID PISTON TOWARD THE OTHER END OF SAID CYLINDER AND THEREBY COMPRESSING SAID SPRING; A BOSS HAVING A LOWER WALL EXTENDING OUTWARDLY FROM SAID PISTON, AND HAVING A BORE; AND MEANS DEFINING A FLUID PASSAGE THROUGH SAID PISTON FOR FLOW OF HYDRAULIC FLUID ON MOVEMENT OF THE PISTON TOWARD SAID OTHER END OF THE CYLINDER, SAID PASSAGE INCLUDING SAID BORE AND PORT MEANS THROUGH THE WALL OF SAID BOSS, HORIZONTALLY SPACED A SUBSTANTIAL DISTANCE FROM THE FACE OF SAID PISTON, SAID PORT MEANS OPENING THROUGH THE LOWER WALL OF SAID BOSS AND HAVING A GREATER EXTENT IN A DIRECTION ALONG THE AXIS OF THE CYLINDER THAN IN A DIRECTION TRANSVERSE THERETO.
Claim 2
Dependent Claim
160 words
IN A HYDRAULIC DOOR CLOSER: A CYLINDER ADAPTED TO CONTAIN HYDRAULIC FLUID; A PISTON SLIDABLE IN SAID CYLINDER; A SPRING URGING SAID PISTON TOWARD ONE END OF SAID CYLINDER; MEANS FOR CONNECTING SAID PISTON AND CYLINDER TO A DOOR AND AN ASSOCIATED FRAME, OPENING MOVEMENT OF SAID DOOR MOVING SAID PISTON TOWARD THE OTHER END OF SAID CYLINDER AND THEREBY COMPRESSING SAID SPRING; A BOSS HAVING A LOWER WALL EXTENDING OUTWARDLY FROM SAID PISTON, AND HAVING A BORE; AND MEANS DEFINING A FLUID PASSAGE THROUGH SAID PISTON FOR FLOW OF HYDRAULIC FLUID ON MOVEMENT OF THE PISTON TOWARD SAID OTHER END OF THE CYLINDER, SAID PASSAGE INCLUDING SAID BORE AND PORT MEANS THROUGH THE WALL OF SAID BOSS, HORIZONTALLY SPACED A SUBSTANTIAL DISTANCE FROM THE FACE OF SAID PISTON, SAID PORT MEANS OPENING THROUGH THE LOWER WALL OF SAID BOSS AND HAVING A GREATER EXTENT IN A DIRECTION ALONG THE AXIS OF THE CYLINDER THAN IN A DIRECTION TRANSVERSE THERETO.
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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) | 1966-02-25 | 1966-08-27 | 1967-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-25 | 1970-08-27 | 1971-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-25 | 1974-08-27 | 1975-02-26 | $7700.00 | Window Closed / Lapsed |