Patent US2555876A successfully refreshed from Google Patents.
US2555876A
Expired / Lapsed
US
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Polyvinyl acetal stabilized with melamine-formaldehyde
Assignee: Shawinigan Resins Corp
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Filing: 1947-01-08
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Granted: 1951-06-05
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Expires: 1967-01-08
Abstract
No abstract record available.
Inventors
- 👤 Robert N Crozier
- 👤 Alfred T Marinaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:02
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3467; C08K5/3477; C08K5/3492; C08K5/34922
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A COMPOSITION COMPRISING A PLASTICIZED POLYVINYL BUTYRALDEHYDE ACETAL RESIN MADE IN THE PRESENCE OF SULFURIC ACID CONTAINING ON A WEIGHT BASE 16-22% HYDROXYL GROUPS CALCULATED AS POLYVINYL ALCOHOL AND LESS THAN 3% ACETATE GROUPS CALCULATED AS POLYVINYL ACETATE AND THE BALANCE BEING THE ACETAL, A SOLUTION OF SAID RESIN BEING ALKALINE TO BROM-PHENOL BLUE AS RESULT OF HAVING ASSOCIATED THEREWITH POTASSIUM HYDROXIDE, AND 0.05-0.5 PART OF TRIMETHYLOL MELAMINE FOR EVERY 100 PART OF ACETAL RESIN WHICH STABILIZES THE THERMOPLASTIC COMPOSITION AGAINST DISCOLORATION AND INSOLUBILITY IN ETHANOL AFTER HEATING FOR TWO HOURS AT 160* C.
Claim 2
Dependent Claim
94 words
A COMPOSITION COMPRISING A PLASTICIZED POLYVINYL BUTYRALDEHYDE ACETAL RESIN MADE IN THE PRESENCE OF SULFURIC ACID CONTAINING ON A WEIGHT BASE 16-22% HYDROXYL GROUPS CALCULATED AS POLYVINYL ALCOHOL AND LESS THAN 3% ACETATE GROUPS CALCULATED AS POLYVINYL ACETATE AND THE BALANCE BEING THE ACETAL, A SOLUTION OF SAID RESIN BEING ALKALINE TO BROM-PHENOL BLUE AS RESULT OF HAVING ASSOCIATED THEREWITH POTASSIUM HYDROXIDE, AND 0.05-0.5 PART OF TRIMETHYLOL MELAMINE FOR EVERY 100 PART OF ACETAL RESIN WHICH STABILIZES THE THERMOPLASTIC COMPOSITION AGAINST DISCOLORATION AND INSOLUBILITY IN ETHANOL AFTER HEATING FOR TWO HOURS AT 160* C.
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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) | 1954-06-04 | 1954-12-04 | 1955-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-04 | 1958-12-04 | 1959-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-04 | 1962-12-04 | 1963-06-05 | $7700.00 | Window Closed / Lapsed |