Patent US6235716B1 successfully refreshed from Google Patents.
US2989511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic polymerization of trioxane
Assignee: Celanese Corp
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Filing: 1958-12-23
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Granted: 1961-06-20
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Expires: 1978-12-23
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Schnlzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:46
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS FOR PREPARING HIGH MOLECULAR WEIGHT POLYMERS WHICH COMPRISES POLYMERIZING TRIOXANE IN THE PRESENCE OF A SMALL CATALYTIC AMOUNT OF A COORDINATE COMPLEX OF BORON FLUORIDE WITH AN ORGANIC COMPOUND OF THE GROUP CONSISTING OF BASIC TRIVALENT NITROGEN AND PHOSPHORUS COMPOUNDS HAVING IONIZATION CONSTANTS IN WATER AT 25*C. NOT HIGHER THAN ABOUT 1X10-9.
Claim 2
Dependent Claim
54 words
A PROCESS FOR PREPARING HIGH MOLECULAR WEIGHT POLYMERS WHICH COMPRISES POLYMERIZING TRIOXANE IN THE PRESENCE OF A SMALL CATALYTIC AMOUNT OF A COORDINATE COMPLEX OF BORON FLUORIDE WITH AN ORGANIC COMPOUND OF THE GROUP CONSISTING OF BASIC TRIVALENT NITROGEN AND PHOSPHORUS COMPOUNDS HAVING IONIZATION CONSTANTS IN WATER AT 25*C. NOT HIGHER THAN ABOUT 1X10-9.
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 |