Patent US2700035A successfully refreshed from Google Patents.
US2700035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyvinyl alcohol
Assignee: EIDP Inc
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Filing: 1950-08-26
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Granted: 1955-01-18
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Expires: 1970-08-26
Abstract
No abstract record available.
Inventors
- 👤 John E Bristol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:47
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12; C08F16/00; C08F16/02; C08F16/04; C08F16/06; C08F116/00; C08F116/02; C08F116/04; C08F116/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
74 words
THE PROCESS FOR THE PRODUCTION OF POLYVINYL ALCOHOL WHICH COMPRISES FORMING AN ALCOHOLIC SOLUTION OF POLYVINYL ACETATE IN THE RATIO BETWEEN 1.3 TO 60 MOLES OF ALCOHOL TO ONE MOLE OF ACETATE, AND CONTAINING A ALCOHOLYSIS CATALYST, FORMING SAID SOLUTION INTO A THIN-BODIED SHAPE HAVING A THICKNESS BETWEEN ABOUT 0.1 MILLIMETER AND 10 MILLIMETERS AND REMOVING ALCOHOL AND BY-PRODUCT ESTER THEREFROM, WHILE RETAINING SUBSTANTIALLY THE AFORESAID SHAPE DURING THE COURSE OF THE RESULTING REACTION.
References Cited (Backward Citations)
FR903576A
Cited
US2467774A
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US2502715A
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US2642419A
Cited
US2605259A
Cited
US2643994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-17 | 1958-07-19 | 1959-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-17 | 1962-07-19 | 1963-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-17 | 1966-07-19 | 1967-01-18 | $7700.00 | Window Closed / Lapsed |