Patent US2643985A successfully refreshed from Google Patents.
US2643985A
Expired / Lapsed
US
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Stabilizing polyester materials with phenyl substituted catechols
Assignee: PPG Industries Inc
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Filing: 1951-04-21
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Granted: 1953-06-30
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Expires: 1971-04-21
Abstract
No abstract record available.
Inventors
- 👤 Earl E Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:24
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
AS A NEW COMPOSITION OF MATTER, A POLYMERIZABLE MIXTURE OF (A) A POLYESTER OF A DIHYDRIC ALCOHOL AND AN A ETHYLENICALLY UNSATURATED DICARBOXYLIC ACID AND (B) A SMALL STABILIZING AMOUNT OF A CATECHOAL CONTAINING A PHENYL GROUP.
Claim 2
Dependent Claim
37 words
AS A NEW COMPOSITION OF MATTER, A POLYMERIZABLE MIXTURE OF (A) A POLYESTER OF A DIHYDRIC ALCOHOL AND AN A ETHYLENICALLY UNSATURATED DICARBOXYLIC ACID AND (B) A SMALL STABILIZING AMOUNT OF A CATECHOAL CONTAINING A PHENYL GROUP.
References Cited (Backward Citations)
GB540167A
Cited
US2506410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |