Patent US2947728A successfully refreshed from Google Patents.
US2947728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic polymerization of trioxane
Assignee: Celanese Corp
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Filing: 1957-10-21
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Granted: 1960-08-02
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Expires: 1977-10-21
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Bartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:54
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A PROCESS FOR PREPARING A TOUGH, HIGH MOLECULAR WEIGHT MATERIAL WHICH COMPRISES POLYMERIZING TRIOXANE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS IN CONTACT WITH NOT MORE THAN ABOUT 1%, BASED ON THE WEIGHT OF TRIOXANE, OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF THIONYL CHLORIDE, PHOSPHRUS TRICHLORIDE, STANNIC CHLORIDE, TITANIUM TETRACHLORIDE, AND ZIRCONIUM TETRACHLORIDE.
Claim 2
Dependent Claim
52 words
A PROCESS FOR PREPARING A TOUGH, HIGH MOLECULAR WEIGHT MATERIAL WHICH COMPRISES POLYMERIZING TRIOXANE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS IN CONTACT WITH NOT MORE THAN ABOUT 1%, BASED ON THE WEIGHT OF TRIOXANE, OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF THIONYL CHLORIDE, PHOSPHRUS TRICHLORIDE, STANNIC CHLORIDE, TITANIUM TETRACHLORIDE, AND ZIRCONIUM TETRACHLORIDE.
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) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |