Patent US2891056A successfully refreshed from Google Patents.
US2628950A
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Modified polyvinyl acetal compositions
Assignee: Monsanto Chemicals Ltd
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Filing: 1949-12-08
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Granted: 1953-02-17
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Expires: 1969-12-08
Abstract
No abstract record available.
Inventors
- 👤 Francis T Buckley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:26
CPC Classifications
C; C08; C08L; C08L29/00; C08L29/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A COMPOSITION COMPRISING A HOMOGENEOUS MECHANICAL MIXTURE OF A POLYVINYL ACETAL RESIN, A PLASTICIZER, AND FROM 1 TO 10 PARTS OF A POLYMERIC VINYL ALKYL ETHER PER 100 PARTS OF RESIN, THE ALKYL GROUPS OF SAID POLYMERIC VINYL ALKYL ETHER CONTAINING FROM 1 TO 12 CARBON ATOMS, AND SAID POLYVINYL ACETAL RESIN CONTAINING ACETAL GROUPS DERIVED FROM A MEMBER OF THE GROUP CONSISTING OF FORMALDEHYDE, ACETALDEHYDE, PROPIONALDEHYDE, BUTYRALDEHYDE, VALERALDEHYDE, HEXALDEHYDE, BENZALDEHYDE, CROTONALDEHYDE AND CYCLOHEXANONE, SAID POLYVINYL ACETAL CONTAINING ON A WEIGHT BASIS, FROM 5 TO 25% HYDROXYL GROUPS CALCULATED AS POLYVINYL ALCOHOL, FROM 0 TO 40% ACETATE GROUPS CALCULATED AS POLYVINYL ACETATE, THE BALANCE BEING ACETAL GROUPS.
Claim 2
Dependent Claim
107 words
A COMPOSITION COMPRISING A HOMOGENEOUS MECHANICAL MIXTURE OF A POLYVINYL ACETAL RESIN, A PLASTICIZER, AND FROM 1 TO 10 PARTS OF A POLYMERIC VINYL ALKYL ETHER PER 100 PARTS OF RESIN, THE ALKYL GROUPS OF SAID POLYMERIC VINYL ALKYL ETHER CONTAINING FROM 1 TO 12 CARBON ATOMS, AND SAID POLYVINYL ACETAL RESIN CONTAINING ACETAL GROUPS DERIVED FROM A MEMBER OF THE GROUP CONSISTING OF FORMALDEHYDE, ACETALDEHYDE, PROPIONALDEHYDE, BUTYRALDEHYDE, VALERALDEHYDE, HEXALDEHYDE, BENZALDEHYDE, CROTONALDEHYDE AND CYCLOHEXANONE, SAID POLYVINYL ACETAL CONTAINING ON A WEIGHT BASIS, FROM 5 TO 25% HYDROXYL GROUPS CALCULATED AS POLYVINYL ALCOHOL, FROM 0 TO 40% ACETATE GROUPS CALCULATED AS POLYVINYL ACETATE, THE BALANCE BEING ACETAL GROUPS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-17 | 1956-08-18 | 1957-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-17 | 1960-08-18 | 1961-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-17 | 1964-08-18 | 1965-02-17 | $7700.00 | Window Closed / Lapsed |