US3714677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door closing mechanism with fluid brake
Assignee: Individual
•
Filing: 1971-02-24
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Granted: 1973-02-06
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Expires: 1991-02-24
Abstract
Abstract THERE IS DISCLOSED A DOOR CLOSING MECHANISM OF THE TYPE INCORPORATING A FLUID BRAKE, AND UTILIZING A PISTON MEMBER WHICH IS DISPLACEABLE BY MEANS OF AT LEAST ONE HELICAL SPRING, A ROTATABLE ROD BEING LOCATED WITHIN SUCH HELICAL SPRING. SEPARATE ADJUSTMENT MEANS ARE PROVIDED FOR THE PURPOSE OF ENABLING THE HELICAL SPRING TO BE ADJUSTABLY POSITIONED ALONG THE ROD. ACCORDING TO AN IMPORTANT ASPECT OF THE INVENTION THE ADJUSTMENT MEANS COMPRISES AT LEAST ONE SUPPORT MEANS, FOR INSTANCE IN THE FORM OF A SUPPORT PIN, FOR THE SPRING, THIS SUPPORT PIN EXTENDING BETWEEN THE WINDINGS OF THE HELICAL SPRING.
Inventors
- 👤 J Schmid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:55
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/04; E05F3/10; E05F3/102; E05Y; E05Y2201/00; E05Y2201/20; E05Y2201/252; E05Y2201/254; E05Y2201/40; E05Y2201/499; E05Y2800/00; E05Y2800/20; E05Y2800/22; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |