US3197445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene oxalate process
Assignee: Olin Corp
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Filing: 1962-07-23
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Granted: 1965-07-27
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Expires: 1982-07-23
Abstract
No abstract record available.
Inventors
- 👤 Warren K Cline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:00
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A METHOD OF PREPARING POLYETHYLENE OXALATE HAVING FILM- AND FIBER-FORMING PROPERTIES WHICH COMPRISES HEATING CYCLIC ETHYLENE OXALATE AT A TEMPERATURE OF ABOUT 165*C. TO ABOUT 210*C. IN A NITROGEN ATMOSPHERE WITH A CATALYST SELECTED FROM THE GROUP CONSISTING OF ALUMINUM CHLORIDE, ZINC CHLORIDE, ANTIMONY TRIFLUORIDE, TITANIUM TETRACHLORIDE, FERRIC CHLORIDE, STANNIC CHLORIDE, ZINC ACETATE, CALCIUM ACETATE, ANTIMONY TRIOXIDE, LEAD OXIDE AND TETRABUTYL TITANATE, SAID CATALYST BEING USED IN AN AMOUNT OF FROM ABOUT 0.003% TO ABOUT 0.03% BY WEIGHT BASED ON OXALATE CONTENT.
Claim 2
Independent Claim
82 words
A METHOD OF PREPARING POLYETHYLENE OXALATE HAVING FILM- AND FIBER-FORMING PROPERTIES WHICH COMPRISES HEATING CYCLIC ETHYLENE OXALATE AT A TEMPERATURE OF ABOUT 165*C. TO ABOUT 210*C. IN A NITROGEN ATMOSPHERE WITH A CATALYST SELECTED FROM THE GROUP CONSISTING OF ALUMINUM CHLORIDE, ZINC CHLORIDE, ANTIMONY TRIFLUORIDE, TITANIUM TETRACHLORIDE, FERRIC CHLORIDE, STANNIC CHLORIDE, ZINC ACETATE, CALCIUM ACETATE, ANTIMONY TRIOXIDE, LEAD OXIDE AND TETRABUTYL TITANATE, SAID CATALYST BEING USED IN AN AMOUNT OF FROM ABOUT 0.003% TO ABOUT 0.03% BY WEIGHT BASED ON OXALATE CONTENT.
References Cited (Backward Citations)
US2951928A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |