US3667977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosion-proof asbestos-cement shapes
Assignee: Certainteed LLC
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Filing: 1970-02-06
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Granted: 1972-06-06
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Expires: 1990-02-06
Abstract
Abstract ASBESTOS-CEMENT SHAPES ARE FORMED FROM A FURNISH CONTAINING A SMALL QUANTITY OF VEGETABLE FIBERS DISTRIBUTED THEREIN, THE SHAPES BEING FORMED BY SCREW EXTRUSION,THEREBY PROVIDING ARTICLES OR SHAPES IN WHICH FIBERS EXTEND RANDOMLY FROM THE EXTERIOR SURFACE OF THE SHAPES INTO THE INTERIOR REGIONS THEREOF AND THUS PROVIDE "BLEED" CHANNELS THROUGH WHICH VAPOR FORMED IN THE INTERIOR MAY ESCAPE WHEN THE SHAPES ARE SUBJECTED TO HEATING, WITH CONSEQUENT SUBSTANTIAL ELIMINIATION OF TENDENCY TO EXPLODE.
Inventors
- 👤 James E Harbison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:06
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04; C04B2111/00; C04B2111/00034; C04B2111/00129; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |