US3305879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torsion spring and mattress edge
Assignee: Kay Manufacturing Corp
•
Filing: 1965-03-03
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Granted: 1967-02-28
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Expires: 1985-03-03
Abstract
No abstract record available.
Inventors
- 👤 Krakauer C Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:33
CPC Classifications
A; A47; A47C; A47C27/00; A47C27/04; A47C27/06; A47C27/066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A ONE-PIECE TORSION SPRING FREE OF COILS AND COMPRISING A CENTRAL TORSION SECTION HAVING A PAIR OF SIMILAR AND COEXTENSIVE TORSION BARS EXTENDING IN TRANSVERSE SPACED RELATION TO EACH OTHER AND A BEND INTEGRALLY JOINING THE CORRESPONDING ENDS OF SAID BARS, AND COLLAPSIBLE AND EXTENSIBLE MEANS AT THE ENDS OF THE BARS REMOTE FROM THE BEND, COPLANAR WITH THE BARS AND NORMALLY EXTENDED FOR TRANSMITTING STRESSES TO SAID BARS TO EXERT TORSIONAL
Claim 2
Dependent Claim
72 words
A ONE-PIECE TORSION SPRING FREE OF COILS AND COMPRISING A CENTRAL TORSION SECTION HAVING A PAIR OF SIMILAR AND COEXTENSIVE TORSION BARS EXTENDING IN TRANSVERSE SPACED RELATION TO EACH OTHER AND A BEND INTEGRALLY JOINING THE CORRESPONDING ENDS OF SAID BARS, AND COLLAPSIBLE AND EXTENSIBLE MEANS AT THE ENDS OF THE BARS REMOTE FROM THE BEND, COPLANAR WITH THE BARS AND NORMALLY EXTENDED FOR TRANSMITTING STRESSES TO SAID BARS TO EXERT TORSIONAL
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) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |