Patent US2804443A successfully refreshed from Google Patents.
US2804443A
Expired / Lapsed
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Modified polystyrene compositions
Assignee: Monsanto Chemicals Ltd
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Filing: 1954-07-14
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Granted: 1957-08-27
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Expires: 1974-07-14
Abstract
No abstract record available.
Inventors
- 👤 Fordham James William Lynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:04
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/08; C08F255/10; Y; Y10; Y10S; Y10S525/00; Y10S525/936
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A TOUGHENED POLYMERIC COMPOSITION PREPARED BY POLYMERIZING STYRENE HAVING DISSOLVED THEREIN A SOLID OXIDIZED ISOBUTYLENE POLYMER, SAID OXIDIZED POLYMER HAVING A COMBINED OXYGEN PICK-UP OF ABOUT 0.2-2%, BASED ON THE ORIGINAL WEIGHT OF THE POLYMER WHICH IS A MEMBER OF THE GROUP CONSISTING OF HOMOPOLYMERS OF ISOBUTYLENE AND COPOLYMERS OF ABOUT 40-99% ISOBUTYLENE WITH, CORRESPONDINGLY, ABOUT 60-1% OF AN ETHYLENICALLY UNSATURATED COMPOUND COPOLYMERIZABLE THEREWITH.
Claim 2
Dependent Claim
64 words
A TOUGHENED POLYMERIC COMPOSITION PREPARED BY POLYMERIZING STYRENE HAVING DISSOLVED THEREIN A SOLID OXIDIZED ISOBUTYLENE POLYMER, SAID OXIDIZED POLYMER HAVING A COMBINED OXYGEN PICK-UP OF ABOUT 0.2-2%, BASED ON THE ORIGINAL WEIGHT OF THE POLYMER WHICH IS A MEMBER OF THE GROUP CONSISTING OF HOMOPOLYMERS OF ISOBUTYLENE AND COPOLYMERS OF ABOUT 40-99% ISOBUTYLENE WITH, CORRESPONDINGLY, ABOUT 60-1% OF AN ETHYLENICALLY UNSATURATED COMPOUND COPOLYMERIZABLE THEREWITH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |