Patent US3632673A successfully refreshed from Google Patents.
US3632673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graft copolymers and suspension process for the manufacture thereof
Assignee: Gulf Research and Development Co
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Filing: 1968-02-20
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Granted: 1972-01-04
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Expires: 1988-02-20
Abstract
Abstract POLYSTRYRENES ARE GRAFTED ONTO POLY(ALPHA OLEFINS) BY POLYMERIZING A SOLUTION OF THE POLY(ALPHA OLEFIN) AND BENZOYL PEROXIDE CATALYST IN A POLYMERIZABLE STYRENE MONOMER WHILE SUSPENDED IN AN AQUEOUS MEDIUM.
Inventors
- 👤 William J Heilman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:35
CPC Classifications
C; C08; C08F; C08F255/00
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |