Patent US5021678A successfully refreshed from Google Patents.
Patent US3147961A successfully refreshed from Google Patents.
US3147961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enclosed spring construction
Assignee: MAROTTA VALVE CORP
•
Filing: 1960-10-27
•
Granted: 1964-09-08
•
Expires: 1980-10-27
Abstract
No abstract record available.
Inventors
- 👤 Kowalski Slawomir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:18
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/32; F16F3/00; F16F3/08; F16F3/10; F16F3/12; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2607; Y10T137/261; Y10T137/6851; Y10T137/7036
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
AN ENCLOSED SPRING ASSEMBLY INCLUDING A CYLINDRICAL HOUSING, A PISTON HOUSING, A PISTON ROD, A FITTING IN AN END WALL OF THE HOUSING AND THROUGH WHICH THE PISTON ROD PASSES AT THE END PORTION OF THE ROD REMOTE FROM THE PISTON, SPRING MEANS BETWEEN THE FITTING AND THE PISTON AND URGING THE PISTON TOWARD ONE END OF ITS STROKE AND AWAY FROM THE FITTING, SAID SPRING MEANS SURROUNDING THE PISTON ROD AND SPACED FROM THE PISTON ROD ALONG MOST OF THE LENGTH OF THE SPRING MEANS, AND THERMAL INSULATION FOAM SURROUNDING THE SPRING MEANS AND EXTENDING INTO THE SPACE BETWEEN THE SPRING MEANS AND THE PISTON ROD, THE INSULATION EXTENDING ALONG A LENGTH OF THE PISTON ROD THROUGHOUT SUBSTANTIALLY THE FULL LENGTH OF THE SPRING, AND SAID INSULATION BEING RESTRAINED AGAINST LATERAL DISPLACEMENT BY THE PISTON ROD, THE SPRING MEANS BEING MADE UP OF A PLURALITY OF DISHED WASHERS TO WHICH THE THERMAL INSULATION IS BONDED AND BY WHICH THE WASHERS ARE HELD IN PLACE WITH RESPECT TO ONE ANOTHER.
Claim 2
Dependent Claim
170 words
AN ENCLOSED SPRING ASSEMBLY INCLUDING A CYLINDRICAL HOUSING, A PISTON HOUSING, A PISTON ROD, A FITTING IN AN END WALL OF THE HOUSING AND THROUGH WHICH THE PISTON ROD PASSES AT THE END PORTION OF THE ROD REMOTE FROM THE PISTON, SPRING MEANS BETWEEN THE FITTING AND THE PISTON AND URGING THE PISTON TOWARD ONE END OF ITS STROKE AND AWAY FROM THE FITTING, SAID SPRING MEANS SURROUNDING THE PISTON ROD AND SPACED FROM THE PISTON ROD ALONG MOST OF THE LENGTH OF THE SPRING MEANS, AND THERMAL INSULATION FOAM SURROUNDING THE SPRING MEANS AND EXTENDING INTO THE SPACE BETWEEN THE SPRING MEANS AND THE PISTON ROD, THE INSULATION EXTENDING ALONG A LENGTH OF THE PISTON ROD THROUGHOUT SUBSTANTIALLY THE FULL LENGTH OF THE SPRING, AND SAID INSULATION BEING RESTRAINED AGAINST LATERAL DISPLACEMENT BY THE PISTON ROD, THE SPRING MEANS BEING MADE UP OF A PLURALITY OF DISHED WASHERS TO WHICH THE THERMAL INSULATION IS BONDED AND BY WHICH THE WASHERS ARE HELD IN PLACE WITH RESPECT TO ONE ANOTHER.
References Cited (Backward Citations)
US1779503A
Cited
US2204988A
Cited
US2162719A
Cited
US2263107A
Cited
US2655935A
Cited
DE827144C
Cited
DE951195C
Cited
US2854995A
Cited
US2818249A
Cited
US2906289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |