Double curvature plywood sheet for back rest
Abstract
Abstract INCREASED AREA OF SAID SECOND CURVATURE. THE OUTER COVERING MAY BE A WATER-REPELLANT PLASTIC MATERIAL FOR USE OUTDOORS, OR IT MAY BE AN UPHOLSTERY MATERIAL WHERE THE BACK REST IS TO BE USED INDOORS WITH OVERSTUFFED FURNITURE OR THE LIKE WHICH IS IMPROPERLY CONTOURED FOR PROPERLY SUPPORTING A USER''S BACK. THE DISCLOSURE DESCRIBES A RIGID SHEET OF PLYWOOD FORMED TO HAVE A DOUBLE CURVATURE. ONE USE DESCRIBED IS AS A PORTABLE BACK REST, PADDED WITH A SOFT MATERIAL OF UNIFORM THICKNESS, SUCH AS FOAM RUBBER, WHICH IS THEN PROVIDED WITH AN OVER-COVER OF AN UPHOLSTERING MATERIAL SUITED TO THE ENVIRONMENT IN WHICH THE BACK REST IS TO BE USED. IN THE FORMING OF THE DOUBLE CURVATURE THE PLYWOOD PLIES ARE STEAMED AND ASSEMBLED PROGRESSIVELY IN DIES HAVING CURVATURES SHAPED TO CONFORM TO THE DOUBLE CURVATURE OF THE USER''S LOWER BACK. TO ACCOMPLISH THE DOUBLE CURVATURE IN WHAT IS SUBSTANTIALLY NON-STRETCHABLE PLYWOOD THE PLIES ARE SLIT OVER THE SECOND CURVATURE TO ALLOW THE PLY TO SPREAD THEREOVER AND CONFORM TO THE
Inventors
- 👤 C Corchran
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |