Patent US3687774A successfully refreshed from Google Patents.
US3687774A
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US
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Method of rendering extremely flexible a relatively rigid and brittle sheet,panel or elongated body of cellular plastic material having compressible foamed cells
Assignee: Individual
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Filing: 1970-01-07
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Granted: 1972-08-29
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Expires: 1990-01-07
Abstract
Abstract A METHOD OF RENDERING EXTREMELY FLEXIBLE A RELATIVELY RIGID AND BRITTLE SHEET, PANEL OR ELONGATED BODY OF CELLULAR PLASTIC MATERIAL (POLYURETHANE, POLYSTYRENE) HAVING COMPRESSIBLE FOAMED CELLS. AT LEAST ONE SURFACE OF THE BODY IS DURING OR SUBSEQUENT TO MANUFACTURE THEREOF, IN SUITABLE MANNER PROVIDED WITH AND ADHERED TO A FLEXIBLE, NON-STRTCHABLE LAYER OF FILM, TO PREVENT RUPTURE OR CRACKFORMATION IN THE STRETCH AREA OF THE BENT PORTION, WHICH WOULD HAVE LEAD TO CONSEQUENT RUPTURE OF THE BODY WHEN SAID BODY IS SUBJECTED TO SHARP BENDING.
Inventors
- 👤 Alfred Grubstad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:11
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/24; E04C2/243; B; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C66/00; B29C66/70; B29C66/72; B29C66/727; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B32; B32B; B32B27/00; B68; B68G; B68G7/00; B68G7/02; B29C65/00; B29C65/56; B29C65/62; B29C66/71; B29K; B29K2309/00; B29K2309/08
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |