Patent US3844636A successfully refreshed from Google Patents.
Patent US2682532A successfully refreshed from Google Patents.
US2682532A
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Polyacetal preparation
Assignee: EIDP Inc
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Filing: 1950-01-27
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Granted: 1954-06-29
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Expires: 1970-01-27
Abstract
No abstract record available.
Inventors
- 👤 Robert L Adelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:37
CPC Classifications
C; C08; C08B; C08B31/00; C08F; C08F16/00; C08F16/12; C08F16/14; C08F16/26; C08G; C08G2/00; C08G2/12; C08G2/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
THE PROCESS FOR THE PRODUCTION OF A POLYMERIC ACETAL WHICH COMPRISES REACTING A MEMBER OF THE GROUP CONSISTING OF DIVINYL ETHER AND GLYCOL DIVINYL ETHERS WITH A HYDROXY COMPOUND SELECTED FROM THE GROUP CONSISTING OF GLYCOLS AND POLYMERIC ALIPHATIC COMPOUNDS EACH MOLECULE OF WHICH CONTAINS MORE THAN 100 CARBON ATOMS AND A PLURALITY OF ALCOHOLIC HYDROXYL GROUPS ATTACHED TO CARBON ATOMS WHICH IN TURN ARE LINKED TO CARBON, ANY OTHER ATOMS ATTACHED TO SUCH HYDROXYL BEARING CARBON ATOMS BEING HYDROGEN IN THE PRESENCE OF ABOUT 0.01 TO 5% BY WEIGHT OF AN ACIDIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF STRONG MINERAL ACIDS AND ACIDIC SALTS THEREOF AT A TEMPERATURE NOT LOWER THAN ABOUT 15* C.
Claim 2
Dependent Claim
116 words
THE PROCESS FOR THE PRODUCTION OF A POLYMERIC ACETAL WHICH COMPRISES REACTING A MEMBER OF THE GROUP CONSISTING OF DIVINYL ETHER AND GLYCOL DIVINYL ETHERS WITH A HYDROXY COMPOUND SELECTED FROM THE GROUP CONSISTING OF GLYCOLS AND POLYMERIC ALIPHATIC COMPOUNDS EACH MOLECULE OF WHICH CONTAINS MORE THAN 100 CARBON ATOMS AND A PLURALITY OF ALCOHOLIC HYDROXYL GROUPS ATTACHED TO CARBON ATOMS WHICH IN TURN ARE LINKED TO CARBON, ANY OTHER ATOMS ATTACHED TO SUCH HYDROXYL BEARING CARBON ATOMS BEING HYDROGEN IN THE PRESENCE OF ABOUT 0.01 TO 5% BY WEIGHT OF AN ACIDIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF STRONG MINERAL ACIDS AND ACIDIC SALTS THEREOF AT A TEMPERATURE NOT LOWER THAN ABOUT 15* C.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-28 | 1957-12-28 | 1958-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-28 | 1961-12-28 | 1962-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-28 | 1965-12-28 | 1966-06-29 | $7700.00 | Window Closed / Lapsed |