US3822340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calcium sulfate whisker fibers and the method for the manufacture thereof
Assignee: FRANKLIN KEY
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Filing: 1972-03-27
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Granted: 1974-07-02
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Expires: 1992-03-27
Abstract
Abstract CALCIUM SULFATE WHISKER FIBERS ARE PROVIDED AS WELL AS A METHOD FOR THE MANUFACTURE THEREOF. THE CALCIUM SULFATE FIBERS OF THIS INVENTION HAVE EXCELLENT TENSILE STRENGTHS AND ARE FIRE-PROO. THE CALCIUM SULFATE WHISKER FIBERS ARE ESPECIALLY USEFUL AS HIGH STRENGTH REINFORCEMENTS FOR SHAPED ARTICLES, AS FIRE-PROOFING AND INSULATION MATERIAL IN CONSTRUCTION OF BUILDINGS IN PLACE OF ASBESTOS, AND AS ADDITIVES FOR PAPER AND THE LIKE.
Inventors
- 👤 J Eberl
- 👤 E Thelen
- 👤 H Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:51
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/60; C30B29/62; B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; C01; C01F; C01F11/00; C01F11/46; C01F11/466; C04; C04B; C04B14/00; C04B14/38; C08; C08J; C08J5/00; C08J5/04; C08K; C08K7/00; C08K7/02; C08K7/04; C09; C09D; C09D7/00; C09D7/40; C09D7/60; C09D7/61; C09D7/70; C09K; C09K17/00; C09K17/02; C09K17/04; C30B29/10; C30B7/00; B29K; B29K2105/00; B29K2105/06; B29K2105/12; B29K2105/126; B29K2709/00; C01P; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/10; C01P2004/54
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) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |