US3259937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic door closer
Assignee: Individual
•
Filing: 1963-09-30
•
Granted: 1966-07-12
•
Expires: 1983-09-30
Abstract
No abstract record available.
Inventors
- 👤 Kotikov Nicholas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:34
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/04; E05F3/10; E05F3/108; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
240 words
A HYDRAULIC DOOR CLOSER COMPRISING: (A) AN OUTER ELONGATED CYLINDER OPEN AT ONE END; (B) AN INNER CYLINDER SLIDABLY MOUNTED IN SAID OPEN END AND HAVING ITS INNER END EXTENDING INTO SAID OUTER CYLINDER; SAID INNER CYLINDER BEING MOVABLE TO HAVE A PORTION PROJECT FROM THE OUTER CYLINDER; (C) A BEARING SLEEVE SLIDABLY MOUNTED IN SAID INNER CYLINCYLINDER AND HAVING THE INNER END OF SAID INNER CYLINDER HERMETICALLY SEALED THERETO; (D) A HEADER CLOSING THE OPPOSITE END OF SAID OUTER CYLINDER AND HAVING A CENTRAL BORE; (E) A HOLLOW PISTON ROD HAVING ONE END SECURED TO SAID HEADER, THE INTERIOR OF SAID PISTON ROD COMMUNICATING WITH THE CENTRAL BORE IN SAID HEADER; (F) SAID BEARING SLEEVE HAVING A CENTRAL OPENING FOR RECEIVING SAID HOLLOW PISTON ROD AND BEING OF A LARGER DIAMETER THAN THE OUTER DIAMETER OF SAID PISTON ROD; (G) A PISTON MOUNTED ON THE END OF SAID HOLLOW PISTON ROD THAT IS DISPOSED OPPOSITE TO THE END CONNECTED TO SAID HEADER, SAID PISTON HAVING A CENTRAL OPENING COMMUNICATING WITH THE INTERIOR OF SAID HOLLOW PISTON ROD; (H) A COIL SPRING DISPOSED BETWEEN SAID OUTER AND INNER CYLINDERS AND BEARING AGAINST SAID BEARING SLEEVE FOR YIELDINGLY URGING SAID SLEEVE TOWARD SAID HEADER FOR MOVING SAID INNER CYLINDER WITHIN SAID OUTER CYLINDER; (I) A FLEXIBLE BELLOWS ENCLOSING SAID HOLLOW PISTON ROD AND HAVING ONE END HERMETICALLY SEALED TO SAID BEARING SLEEVE SO AS TO ENCLOSE THE CENTRAL OPENING IN SAID
Claim 2
Dependent Claim
240 words
A HYDRAULIC DOOR CLOSER COMPRISING: (A) AN OUTER ELONGATED CYLINDER OPEN AT ONE END; (B) AN INNER CYLINDER SLIDABLY MOUNTED IN SAID OPEN END AND HAVING ITS INNER END EXTENDING INTO SAID OUTER CYLINDER; SAID INNER CYLINDER BEING MOVABLE TO HAVE A PORTION PROJECT FROM THE OUTER CYLINDER; (C) A BEARING SLEEVE SLIDABLY MOUNTED IN SAID INNER CYLINCYLINDER AND HAVING THE INNER END OF SAID INNER CYLINDER HERMETICALLY SEALED THERETO; (D) A HEADER CLOSING THE OPPOSITE END OF SAID OUTER CYLINDER AND HAVING A CENTRAL BORE; (E) A HOLLOW PISTON ROD HAVING ONE END SECURED TO SAID HEADER, THE INTERIOR OF SAID PISTON ROD COMMUNICATING WITH THE CENTRAL BORE IN SAID HEADER; (F) SAID BEARING SLEEVE HAVING A CENTRAL OPENING FOR RECEIVING SAID HOLLOW PISTON ROD AND BEING OF A LARGER DIAMETER THAN THE OUTER DIAMETER OF SAID PISTON ROD; (G) A PISTON MOUNTED ON THE END OF SAID HOLLOW PISTON ROD THAT IS DISPOSED OPPOSITE TO THE END CONNECTED TO SAID HEADER, SAID PISTON HAVING A CENTRAL OPENING COMMUNICATING WITH THE INTERIOR OF SAID HOLLOW PISTON ROD; (H) A COIL SPRING DISPOSED BETWEEN SAID OUTER AND INNER CYLINDERS AND BEARING AGAINST SAID BEARING SLEEVE FOR YIELDINGLY URGING SAID SLEEVE TOWARD SAID HEADER FOR MOVING SAID INNER CYLINDER WITHIN SAID OUTER CYLINDER; (I) A FLEXIBLE BELLOWS ENCLOSING SAID HOLLOW PISTON ROD AND HAVING ONE END HERMETICALLY SEALED TO SAID BEARING SLEEVE SO AS TO ENCLOSE THE CENTRAL OPENING IN SAID
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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) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |