Patent US2587549A successfully refreshed from Google Patents.
US2587549A
Expired / Lapsed
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Polystyrenes stabilized with organo amidophosphates
Assignee: Monsanto Chemicals Ltd
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Filing: 1949-02-19
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Granted: 1952-02-26
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Expires: 1969-02-19
Abstract
No abstract record available.
Inventors
- 👤 Quirino A Trementozzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:24
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/5399
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A POLYMER HAVING IMPROVED STABILIZATION TO MOLECULAR WEIGHT DEGRADATION WHICH COMPRISES A STYRENE POLYMER AND FROM 0.1 TO FIVE PERCENT BY WEIGHT OF A COMPOUND HAVING THE STRUCTURAL FORMULA:
Claim 2
Dependent Claim
29 words
A POLYMER HAVING IMPROVED STABILIZATION TO MOLECULAR WEIGHT DEGRADATION WHICH COMPRISES A STYRENE POLYMER AND FROM 0.1 TO FIVE PERCENT BY WEIGHT OF A COMPOUND HAVING THE STRUCTURAL FORMULA:
References Cited (Backward Citations)
US2487859A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |