Patent US2989509A successfully refreshed from Google Patents.
US2989509A
Expired / Lapsed
US
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Trioxane polymer stabilization
Assignee: Celanese Corp
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Filing: 1958-02-28
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Granted: 1961-06-20
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Expires: 1978-02-28
Abstract
No abstract record available.
Inventors
- 👤 Donald E Hudgin
- 👤 Frank M Berardinelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:49
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/10; C08G2/18; C08G2/24; C08G2/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
THE METHOD WHICH COMPRISES TREATING A POLYMERIZATION PRODUCT MIXTURE OF TRIOXANE, SOLID, RESINOUS POLYOXYMETHYLENE AND AN ACIDIC TRIOXANE-POLYMERIZATION CATALYST WITH A CATALYST DEACTIVATION AGENT TO DEACTIVATE THE CATALYST THEREIN AND THEREAFTER REMOVING TRIOXANE FROM SAID MIXTURE.
Claim 2
Independent Claim
36 words
THE METHOD WHICH COMPRISES TREATING A POLYMERIZATION PRODUCT MIXTURE OF TRIOXANE, SOLID, RESINOUS POLYOXYMETHYLENE AND AN ACIDIC TRIOXANE-POLYMERIZATION CATALYST WITH A CATALYST DEACTIVATION AGENT TO DEACTIVATE THE CATALYST THEREIN AND THEREAFTER REMOVING TRIOXANE FROM SAID MIXTURE.
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) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |