Patent US2249757A successfully refreshed from Google Patents.
Patent US3661839A successfully refreshed from Google Patents.
US3661839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat curable glass fiber filled polyvinyl chloride compositions
Assignee: Ethyl Corp
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Filing: 1970-03-02
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Granted: 1972-05-09
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Expires: 1990-03-02
Abstract
Abstract A CROSS-LINKED, HEAT STABLE, GLASS FILLED POLYVINYL HALIDE COMPOSITION AND A PROCESS FOR THE PREPARATION THEREOF. THE COMPOSITION IS PREPARED BY MIXING TOGETHER POLYVINYL HALIDE RESIN, A STABILIZER, A LUBRICANT, A CROSS-LINKABLE MONOMER, AN INHIBITOR, AND GLASS FIBERS TO FORM A DRY BLEND WHICH IS MILLED ON A HOT, TWO-ROLL MILL TO FORM A RIGID SHEET. THE SHEET IS HEAT TREATED TO INCREASE DEFLECTION TEMPERATURE.
Inventors
- 👤 Oskar E H Klopfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:15
CPC Classifications
C; C08; C08F; C08F259/00; C08F259/02; C08F259/04; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |