US3640949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of flame retardant polypropylene compositions
Assignee: Great Lakes Chemical Corp
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Filing: 1969-04-29
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Granted: 1972-02-08
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Expires: 1989-04-29
Abstract
Abstract POLYPROPYLENE IS RENDERED FLAME RETARDANT WITHOUT IMPAIRING ITS PHYSICAL PROPERTIES BY INCORPORATING IN IT AN ADDITIVE COMPRISED OF TETRABROMOPHTHALIC ANHYDRIDE, A FUMED SILICA, AND ANTIMONY TRIOXIDE OR AN EQUIVALENT ANTIMONY COMPOUND.
Inventors
- 👤 Darwin Allen Dalzell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:47
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1535; C08K5/1539; C08K13/00; C08K13/02
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |