Patent US2786574A successfully refreshed from Google Patents.
US2989510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High molecular weight polymer and process therefor
Assignee: Celanese Corp
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Filing: 1958-06-20
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Granted: 1961-06-20
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Expires: 1978-06-20
Abstract
No abstract record available.
Inventors
- 👤 George J Bruni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:44
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
IN A PROCESS FOR OBTAINING HIGH MOLECULAR WEIGHT POLYOXYMETHYLENE WHEREIN TRIOXANE IS POLYMERIZED IN ADMIXTURE WITH A TRIOXANE-POLYMERIZATION CATALYST, THE IMPROVEMENT WHICH COMPRISES INITIATING POLYMERIZATION OF SAID TRIOXANE IN SOLUTION IN AN INERT NON-AQUEOUS SOLVENT AND CONTINUING THE POLYMERIZATION OF THE TRIOXANE AT A TEMPERATURE NOT HIGHER THAN ABOUT 2*C. ABOVE THE PRECIPITATION TEMPERATURE OF SAID TRIOXANE IN SOLUTION.
Claim 2
Dependent Claim
59 words
IN A PROCESS FOR OBTAINING HIGH MOLECULAR WEIGHT POLYOXYMETHYLENE WHEREIN TRIOXANE IS POLYMERIZED IN ADMIXTURE WITH A TRIOXANE-POLYMERIZATION CATALYST, THE IMPROVEMENT WHICH COMPRISES INITIATING POLYMERIZATION OF SAID TRIOXANE IN SOLUTION IN AN INERT NON-AQUEOUS SOLVENT AND CONTINUING THE POLYMERIZATION OF THE TRIOXANE AT A TEMPERATURE NOT HIGHER THAN ABOUT 2*C. ABOVE THE PRECIPITATION TEMPERATURE OF SAID TRIOXANE IN SOLUTION.
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 |