US3566434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescopic closer for doors
Assignee: BLATT MEL
•
Filing: 1969-02-03
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Granted: 1971-03-02
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Expires: 1989-02-03
Abstract
Abstract CLOSER FOR SLIDE CLOSURE AND HINGED CLOSURES. THE CLOSER IS OF THE TELESCOPIC TYPE AND, WHEN THE CLOSURE CONTROLLED THEREBY IS OPEN, THE RATE OF RESTORATION OF THE CLOSURE TO CLOSED POSITION IS CONTROLLED BY A SPRING AND AN AIR CUSHION, BOTH INTERNALLY LOCATED IN THE CLOSER. BY MANIPULATION OF EXTERNAL DEVICES PROVIDED, THE EFFECTIVE SPRING TENSION AND THE BLEED RATE OF THE AIR CUSHION IN THE CLOSER ARE READILY ADJUSTED. A VACUUM BREAKING VALVE ON ONE OF THE TELESCOPING MEMBERS AUTOMATICALLY OPENS AND PREVENTS A VACUUM FROM DEVELOPING IN THE VOLUME OF THE AIR CUSHION WHEN THE CLOSER IS EXTENDED.
Inventors
- 👤 James J Grinsteiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:30
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/02; E05Y; 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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |