Structural shape based on waste paper and method of providing the same
Abstract
Abstract A STRUCTURAL SHAPE IS PROVIDED BY TREATING DRY WASTE PAPER IN A HAMMER MILL HAVING A PERIPHERAL SPEED OF ABOUT 4500 FEET PER MINUTE UNTIL THE WASTE PAPER IS REDUCED TO INDIVIDUAL PAPER FIBERS. THE FIBERS ARE WITHDRAWN BY VACUUM FROM THE HAMMER MILL THROUGH A SCREEN. THEY ARE COATED THROUGHLY WITH AN AQUEOUS BINDER, SUCH AS POLYVINYL CHLORIDE, UREA-FORMALDEHYDE OR PHENOLIC RESIN. A SUFFICIENT MASS OF SO-COATED FIBERS IS THEN COMPRESSED (WITH RELEASE OF WATER) UNDER PRESSURE OF ABOUT 6000 POUNDS PER SQUARE INCH AND IS THEN BAKED IN COMPRESSED FORM FOR SIX TO EIGHT HOURS AT ABOUT 250* FAHRENHEIT TO RESULT IN A GEOMETRICAL BODY HAVING A DENSITY OF ABOUT 40 POUNDS PER CUBIC FOOT. THE COMPLETED BODY IS ADEQUATELY STRONG AND IS OTHERWISE SUITABLE FOR CONSTRUCTION OR BUILDING PURPOSES.
Inventors
- 👤 K Evers
- 👤 G Larsen
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |