US3749591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming a polysiloxane impregnated porous sheet and article thereof
Assignee: OI Glass Inc
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Filing: 1970-12-11
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Granted: 1973-07-31
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Expires: 1990-12-11
Abstract
Abstract A POROUS SHEET IS FORMED BY FIRST IMPREGNATING A FIBROUS WEB WITH ABOUT 2% TO 99.75% OF AN ORGANOPOLYSILOXANE AND THEREAFTER PRESSING SAID WEB AND FULLY CURING SAID SILOXANE TO FORM A SUBTANTIALLY NONPOROUS SHEET. THEREAFTER, THE IMPREGNATED SHEET IS HEATED TO THE POINT AT WHICH AT LEAST A PORTION OF THE ORGANIC CONSTITUENTS PRESENT IN THE SHEET, AND ESPECIALLY IN THE SILOXANE, VOLATILIZE TO LEAVE A POROUS STRUCTURE EXHIBITING GOOD STRUCTURAL STRENGTH AND OTHER DESIRABLE PHYSICAL PROPERTIES.
Inventors
- 👤 R Martin
- 👤 S Hider
- 👤 W Kitaj
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:50
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/48; C; C11; C11D; C11D1/00; C11D1/88; C11D1/94; C11D3/00; C11D3/0005; C11D3/001; D; D21; D21J; D21J1/00
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |