US3819772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making thin defect-free silicone rubber films and membranes
Assignee: United States Department of Health and Human Services
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Filing: 1973-02-23
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Granted: 1974-06-25
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Expires: 1993-02-23
Abstract
Abstract A METHOD OF MAKING THIN DEFECT-FREE SILICONE RUBBER FILM AND MEMBRANES WHICH COMPRISES FORMING A DISPERSION OF A SILICONE RUBBER STOCK COMPOUNDED WITH REINFORCING FILLER MATERIAL, CENTRIFUGING THE DISPERSION SO AS TO REMOVE THEREFROM UNDISPERSED FILLER AGREGATES, CASTING A FILM OF THE CENTRIFUGED DISPERSION ONTO A RELEASABLE CARRIER SUBSTRATE, EVAPORATING THE SOLVENT FROM THE FILM, AND CURING THE FILM. THE FILM MAY THEREAFTER BE SUBJECTED TO A POST-CURE WITH ULTRAVIOLET RADIATION WHICH SIGNIFICANTLY INCREASES ITS TENSILE STRENGTH AND BURST STRENGTH AND DECREASES ITS ELONGATION.
Inventors
- 👤 T Kolobow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:44
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0011; B01D67/0013; B01D2323/00; B01D2323/08; B01D2323/081
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |