US2956983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of colorless polyolefines by the low pressure process
Assignee: Bergwerksgesellschaft Hibernia AG
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Filing: 1956-02-28
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Granted: 1960-10-18
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Expires: 1976-02-28
Abstract
No abstract record available.
Inventors
- 👤 Rindtorff Ermbrecht
- 👤 Schmitt Karl
- 👤 Keller Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:31
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
IMPROVEMENTS IN THE PRODUCTION OF COLORLESS POLYMERIC OLEFINS OF THE CLASS CONSISTING OF POLYETHYLENE AND POLYPROPYLELE, WHEREIN A TATANIUM HALIDE CATALYST IS USED TO EFFECT POLYMERIZATION OF THE OLEFIN, WHICH COMPRISES WASHING THE FRESLY PREPARED POLYMER WITH A WASHING LIQUID WHICH INCLUDES A HIGH BOILING ALCOHOLIC COMPOUND WHICH COMBINES WITH RESIDUAL TRACES OF THE TITANIUM CATALYST, SAID HIGH BOILING ALCOHOLIC COMPOUND BEING SELECTED FROM THE CLASS CONSISTING OF GLYCOL, GLYCEROL, SORBITOL AND CYCLOHEXANOL, AND BEING PRESENT IN AN AMOUNT OF AT LEAST 0.01% CALCULATED ON THE DRY POLYMER.
Claim 2
Dependent Claim
88 words
IMPROVEMENTS IN THE PRODUCTION OF COLORLESS POLYMERIC OLEFINS OF THE CLASS CONSISTING OF POLYETHYLENE AND POLYPROPYLELE, WHEREIN A TATANIUM HALIDE CATALYST IS USED TO EFFECT POLYMERIZATION OF THE OLEFIN, WHICH COMPRISES WASHING THE FRESLY PREPARED POLYMER WITH A WASHING LIQUID WHICH INCLUDES A HIGH BOILING ALCOHOLIC COMPOUND WHICH COMBINES WITH RESIDUAL TRACES OF THE TITANIUM CATALYST, SAID HIGH BOILING ALCOHOLIC COMPOUND BEING SELECTED FROM THE CLASS CONSISTING OF GLYCOL, GLYCEROL, SORBITOL AND CYCLOHEXANOL, AND BEING PRESENT IN AN AMOUNT OF AT LEAST 0.01% CALCULATED ON THE DRY POLYMER.
References Cited (Backward Citations)
GB614594A
Cited
US2699457A
Cited
US2711401A
Cited
US2845412A
Cited
US2834768A
Cited
US2827445A
Cited
US2919264A
Cited
US2928815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |