Patent US2529166A successfully refreshed from Google Patents.
Patent US2831840A successfully refreshed from Google Patents.
US2831840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating polymer coagulates
Assignee: Shell Development Co
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Filing: 1954-06-28
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Granted: 1958-04-22
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Expires: 1974-06-28
Abstract
No abstract record available.
Inventors
- 👤 Lindeboom Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:20
CPC Classifications
C; C08; C08L; C08L57/00; C08F; C08F6/00; C08F6/26; Y; Y10; Y10S; Y10S8/00; Y10S8/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A PROCESS FOR TREATING WET COAGULATES OF NON-RUBBERY POLYMERS OF ETHYLENICALLY UNSATURATED COMPOUNDS OF THE GROUP CONSISTING OF VINYL HALIDES AND VINYLIDENE HALIDES, WHICH COAGULATES CONTAIN AT LEAST 30% WATER, WHICH COMPRISES PRESSING THE PARTICLES OF THE WET COAGULATE, WHICH HAVE BEEN INITIALLY HEATED TO A TEMPERATURE BETWEEN 30*C. AND 80*C., TOGETHER UNDER A PRESSURE OF 150 TO 80 ATMOSPHERES IN AN ENCLOSED ZONE UNTIL THE WATER CONTENT HAS BEEN REDUCED TO LESS THAN 5%, SIMULTANEOUSLY WITHDRAWING THE EXPELLED WATER, AND GRINDING THE COMPRESSED PARTICLES.
Claim 2
Dependent Claim
85 words
A PROCESS FOR TREATING WET COAGULATES OF NON-RUBBERY POLYMERS OF ETHYLENICALLY UNSATURATED COMPOUNDS OF THE GROUP CONSISTING OF VINYL HALIDES AND VINYLIDENE HALIDES, WHICH COAGULATES CONTAIN AT LEAST 30% WATER, WHICH COMPRISES PRESSING THE PARTICLES OF THE WET COAGULATE, WHICH HAVE BEEN INITIALLY HEATED TO A TEMPERATURE BETWEEN 30*C. AND 80*C., TOGETHER UNDER A PRESSURE OF 150 TO 80 ATMOSPHERES IN AN ENCLOSED ZONE UNTIL THE WATER CONTENT HAS BEEN REDUCED TO LESS THAN 5%, SIMULTANEOUSLY WITHDRAWING THE EXPELLED WATER, AND GRINDING THE COMPRESSED PARTICLES.
References Cited (Backward Citations)
GB661881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |