Patent US2998409A successfully refreshed from Google Patents.
US2998409A
Expired / Lapsed
US
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Polyoxymethylene carboxylates of improved thermal stability
Assignee: EIDP Inc
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Filing: 1957-08-30
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Granted: 1961-08-29
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Expires: 1977-08-30
Abstract
No abstract record available.
Inventors
- 👤 Nogare Stephen Dal
- 👤 Punderson John Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:55
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/30; C08G2/32; Y; Y10; Y10S; Y10S74/00; Y10S74/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A POLYOXYMETHYLENE CARBOXYLATE HAVING A REACTION RATE CONSTANT FOR THERMAL DEGRADATION AT 222*C, OF LESS THAN 1% BY WEIGHT PER MINUTE, SUBSTANTIALLY ALL OF THE POLYMER CHAINS OF SAID POLYOXYMETHYLENE CARBOXYLATE HAVING THE STRUCTURAL FORMULA:
Claim 2
Dependent Claim
35 words
A POLYOXYMETHYLENE CARBOXYLATE HAVING A REACTION RATE CONSTANT FOR THERMAL DEGRADATION AT 222*C, OF LESS THAN 1% BY WEIGHT PER MINUTE, SUBSTANTIALLY ALL OF THE POLYMER CHAINS OF SAID POLYOXYMETHYLENE CARBOXYLATE HAVING THE STRUCTURAL FORMULA:
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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |