Patent US3168495A successfully refreshed from Google Patents.
US3168495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyoxymethylenes from trioxane
Assignee: Evonik Operations GmbH
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Filing: 1961-08-07
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Granted: 1965-02-02
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Expires: 1981-08-07
Abstract
No abstract record available.
Inventors
- 👤 Hopff Heinrich
- 👤 Metzler Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:59
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08; C08G2/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A METHOD OF POLYMERIZING TRIOXANE WHICH COMPRISES HEATING TRIOXANE IN CONTACT WITH 0.01 TO 5% BASED UPON THE QUANTITY OF TRIOXANE OF AN ORANIC COMPOUND ACTIVE AS A HALOGENATING AGENT SELECTED FROM THE GROUP CONSISTING OF PHENYL IODIDE CHLORIDE, HALOGEN SUCCINIMIDE, PERCHLOROMETHYL MERCAPTAN AND SODIUM-P-TOLUENE SULFONCHLORAMIDE TO TEMPERATURES BETWEEN 50 AND 150*C.
Claim 2
Independent Claim
52 words
A METHOD OF POLYMERIZING TRIOXANE WHICH COMPRISES HEATING TRIOXANE IN CONTACT WITH 0.01 TO 5% BASED UPON THE QUANTITY OF TRIOXANE OF AN ORANIC COMPOUND ACTIVE AS A HALOGENATING AGENT SELECTED FROM THE GROUP CONSISTING OF PHENYL IODIDE CHLORIDE, HALOGEN SUCCINIMIDE, PERCHLOROMETHYL MERCAPTAN AND SODIUM-P-TOLUENE SULFONCHLORAMIDE TO TEMPERATURES BETWEEN 50 AND 150*C.
References Cited (Backward Citations)
US2989508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |