Patent US3826775A successfully refreshed from Google Patents.
US3826775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified alumina hydrate flame retardant filler for polypropylene
Assignee: CIT Group Business Credit Inc
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Filing: 1973-06-21
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Granted: 1974-07-30
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Expires: 1993-06-21
Abstract
Abstract FLAME RETARDANCY IS IMPARTED TO POLYPROPYLENE BY THE INCORPORATION OF 40-70% BY WEIGHT OF MODIFIED ALUMINA HYDRATE, THE PERCENTAGE BEING BASED ON THE FILLED POLYPROPYLENE. THE ALUMINA HYDRATE IS MADE COMPATIBLE WITH POLYPROPYLENE BY ADDITION OF 0.2-5% BY WEIGHT OF AN ALKYLKETENE DIMER OF THE GENERAL FORMULA 3-R1,4-(R2=)-OXETAN-2-ONE WHEREIN R1 AND R2 EACH HAVE 14-20 CARBON ATOMS.
Inventors
- 👤 I Sobolev
- 👤 E Woycheshin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:01
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/04
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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |