Patent US3131420A successfully refreshed from Google Patents.
US3131420A
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Assignee: Ideal Brass Works Inc
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Filing: 1961-04-24
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Granted: 1964-05-05
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Expires: 1981-04-24
Abstract
No abstract record available.
Inventors
- 👤 Bert A Quinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:18
CPC Classifications
F; F16; F16F; F16F7/00; F16F7/08; F16F7/09; E; E05; E05F; E05F3/00; E05F3/02; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
IN A DOOR CLOSER, AN ELONGATED CYLINDER, AN ELONGATED PLUNGER ROD HAVING A SPRING COILED THEREAROUND TELESCOPICALLY EXTENDED INTO SAID CYLINDER FROM ONE END THEREOF, A PISTON CARRIED AT THE INNER END OF SAID ROD WITHIN SAID CYLINDER AND HAVING MEANS FRICTIONALLY ENGAGING THE CYLINDER WALL TO PROVIDE THEREWITH A COMPRESSION CHAMBER ON MOVEMENT OF SAID ROD IN SAID CYLINDER, SAID CYLINDER HAVING A RELATIVELY NARROW CIRCUMFERENTIALLY CONTRACTED PORTION ADJACENT SAID ONE END IN AXIALLY SPACED RELATION TO SAID PISTON IN SAID CYLINDER, AND A FLEXIBLE FRICTION HOLDING MEMBER CONNECTED TO ONE END OF SAID PISTON TO EXTEND AXIALLY THEREOF WITHIN SAID CYLINDER IN RADIAL SPACED RELATION THERETO AND TO SAID ROD, SAID HOLDING MEMBER BEING AXIALLY MOVABLE WITH SAID PISTON INTO FRICTIONAL HOLDING ENGAGEMENT WITH SAID RESTRICTED PORTION OF SAID CYLINDER AXIALLY SPACED FROM SAID PISTON TO HOLD SAID PISTON AND ROD AGAINST MOVEMENT IN SAID CYLINDER UNDER THE ACTION OF SAID COILED SPRING.
Claim 2
Dependent Claim
155 words
IN A DOOR CLOSER, AN ELONGATED CYLINDER, AN ELONGATED PLUNGER ROD HAVING A SPRING COILED THEREAROUND TELESCOPICALLY EXTENDED INTO SAID CYLINDER FROM ONE END THEREOF, A PISTON CARRIED AT THE INNER END OF SAID ROD WITHIN SAID CYLINDER AND HAVING MEANS FRICTIONALLY ENGAGING THE CYLINDER WALL TO PROVIDE THEREWITH A COMPRESSION CHAMBER ON MOVEMENT OF SAID ROD IN SAID CYLINDER, SAID CYLINDER HAVING A RELATIVELY NARROW CIRCUMFERENTIALLY CONTRACTED PORTION ADJACENT SAID ONE END IN AXIALLY SPACED RELATION TO SAID PISTON IN SAID CYLINDER, AND A FLEXIBLE FRICTION HOLDING MEMBER CONNECTED TO ONE END OF SAID PISTON TO EXTEND AXIALLY THEREOF WITHIN SAID CYLINDER IN RADIAL SPACED RELATION THERETO AND TO SAID ROD, SAID HOLDING MEMBER BEING AXIALLY MOVABLE WITH SAID PISTON INTO FRICTIONAL HOLDING ENGAGEMENT WITH SAID RESTRICTED PORTION OF SAID CYLINDER AXIALLY SPACED FROM SAID PISTON TO HOLD SAID PISTON AND ROD AGAINST MOVEMENT IN SAID CYLINDER UNDER THE ACTION OF SAID COILED SPRING.
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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |