Elastic foam carpet underlay
Abstract
Abstract A FIREPROOF CARPET UNDERLAY IS PROVIDED WHICH HAS IMPROVED LOAD-DEFLECTION CHARACTERISTICS AND YET CAN BE MADE AT A FRACTION OF THE COAT OF CONVENTIONAL CARPET UNDERLAY. THE UNDERLAY IS MADE FROM POLYURETHANE FOAM SCRAP OF LOW DENSITY (I.E., 1 TO 3 POUNDS PER CUBIC FOOT) AND TWO THIN SHEETS OF INEXPENSVE PLASTIC MATERIAL, SUCH AS POLYETHYLENE OR POLYVINYL CHLORIDE COATED WITH A VINYLIDENE CHLORIDE POLYMER. THE UNDERLAY HAS A MULTIPLICITY OF REGULARLY SPACED CIRCULAR OR POLYGONAL POCKETS SAND- WICHED BETWEEN THE TWO PLASTIC SHEETS AND CONTAINING A SUBSTANTIAL AMOUNT OF AIR AND A FIRE-RETARDANE LIQUID, SUCH AS WATER, IN A MAJOR AMOUNT BY WEIGHT SUFFICIENT FOR FIREPROOFING. EACH POCKET FUNCTIONS AS AN AIR CUSHION AND TAKES UP A SUBSTANTIAL PROPORTION OF THE LOAD (I.E., 20 TO 50 PERCENT) BY COMPRESSION OF AIR, THE BALANCE BEING TAKEN BY COMPRESSION OF THE FOAM.
Inventors
- 👤 L Varner
Bibliographic Details
Claims Analysis
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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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |