Patent US3081343A successfully refreshed from Google Patents.
US3081343A
Expired / Lapsed
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Polyethers from polyacetals and olefins
Assignee: Bayer AG
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Filing: 1958-10-20
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Granted: 1963-03-12
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Expires: 1978-10-20
Abstract
No abstract record available.
Inventors
- 👤 Merten Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:14
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/002; C08G2/00; C08G2/18; C08G4/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A LINEAR POLYETHER HAVING A MOLECULAR WEIGHT OF AT LEAST 500 PREPARED BY THE PROCESS WHICH COMPRISES REACTNG AT A TEMPERATURE OF FROM ABOUT- 20* C. TO ABOUT + 100* C. A LINEAR POLYACETAL WHICH CONTAINS FREE HYDROXYL GROUPS IN THE RANGE OF FROM ABOUT 0.5% TO ABOUT 15% BY WEIGHT AND PREPARED BY REACTING AN ALDEHYDE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE, ACETALDHYDE AND GLYOXAL AND A POLYHYDRIC ALCOHOL, WITH AN ETHYLENICALLY UNSATURATED COMPOUND CONTAINING AT LEAST ONE ACTIVATED CARBON-CARBON DOUBLE BOND AND HAVING LESS THAN ABOUT 13 CARBON ATOMS, SAID UNSATURATED COMPOUND BEING FREE FROM HETEROCYCLIC RINGS IN ADMIXTURE WITH AN ACID CATALYST PRESENT IN AN AMOUNT OF FROM ABOUT 0.01 TO ABOUT 15% BY WEIGHT BASED ON THE WEIGHT OF SAID LINEAR POLYACETAL.
Claim 2
Dependent Claim
127 words
A LINEAR POLYETHER HAVING A MOLECULAR WEIGHT OF AT LEAST 500 PREPARED BY THE PROCESS WHICH COMPRISES REACTNG AT A TEMPERATURE OF FROM ABOUT- 20* C. TO ABOUT + 100* C. A LINEAR POLYACETAL WHICH CONTAINS FREE HYDROXYL GROUPS IN THE RANGE OF FROM ABOUT 0.5% TO ABOUT 15% BY WEIGHT AND PREPARED BY REACTING AN ALDEHYDE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE, ACETALDHYDE AND GLYOXAL AND A POLYHYDRIC ALCOHOL, WITH AN ETHYLENICALLY UNSATURATED COMPOUND CONTAINING AT LEAST ONE ACTIVATED CARBON-CARBON DOUBLE BOND AND HAVING LESS THAN ABOUT 13 CARBON ATOMS, SAID UNSATURATED COMPOUND BEING FREE FROM HETEROCYCLIC RINGS IN ADMIXTURE WITH AN ACID CATALYST PRESENT IN AN AMOUNT OF FROM ABOUT 0.01 TO ABOUT 15% BY WEIGHT BASED ON THE WEIGHT OF SAID LINEAR POLYACETAL.
References Cited (Backward Citations)
US2366738A
Cited
US2165962A
Cited
US2224663A
Cited
US2394862A
Cited
US2382640A
Cited
US2479146A
Cited
US2522680A
Cited
US2601572A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |