Patent US3551924A successfully refreshed from Google Patents.
US3551924A
Expired / Lapsed
US
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Variable firmness sleep unit
Assignee: Individual
•
Filing: 1969-05-19
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Granted: 1971-01-05
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Expires: 1989-05-19
Abstract
Abstract A SLEEP UNIT INCLUDING A RESILIENT MATTRESS HAVING VERTICALLY MOVABLE SUPPORT RODS EXTENDING THERETHROUGH AND RESILIENTLY BIASED AGAINST DOWNWARD MOVEMENT IMPARTED THERETO BY A RECLINING BODY ON THE MATTRESS. VERTICALLY MOVABLE MEANS UNDERLYING THE SUPPORT RODS IS OPERABLE TO VARY THE BIAS AGAINST THE SUPPORT RODS, THE RODS HAVING FLEXIBLE HEAD ELEMENTS MOUNTED ON THEIR UPPER ENDS FOR UNIVERSAL TILTING MOVEMENTS RELATIVE TO THE AXES OF THEIR RESPECTIVE SUPPORT RODS.
Inventors
- 👤 James R Frye Sr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:33
CPC Classifications
A; A47; A47C; A47C27/00; A47C27/14; A47C27/148; A47C23/00; A47C23/04; A47C23/043; A47C23/0435; A47C27/15; Y; Y10; Y10S; Y10S5/00; Y10S5/935
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |