Patent US2947723A successfully refreshed from Google Patents.
US2947723A
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US
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Chloroethylene polymers stabilized with 2, 4-dihydroxy-3-allyl benzophenone and substituted derivatives thereof
Assignee: Dow Chemical Co
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Filing: 1956-11-07
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Granted: 1960-08-02
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Expires: 1976-11-07
Abstract
No abstract record available.
Inventors
- 👤 Gerald A Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:38
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/61; C07C45/67; C07C49/00; C07C49/76; C07C49/82; C07C49/835; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/132; Y; Y10; Y10T; Y10T24/00; Y10T24/15; Y10T24/155
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A LIGHT STABLE THERMOPLASTIC COMPOSITION COMPRISING A CHLORO-ETHYLENE POLYMER COMPOSED OF AT LEAST 50 PERCENT BY WEIGHT OF VINYLIDENE CHLORIDE WITH ANY REMAINDER BEING AT LEAST ONE MONOETHYLENICALLY UNSATURATED COMONOMER AND FROM 0.5 TO 6 PERCENT OF THE WEIGHT OF SAID POLYMER OF A 2,4-DIHYDROXYBENZOPHENONE DERIVATIVE HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
50 words
A LIGHT STABLE THERMOPLASTIC COMPOSITION COMPRISING A CHLORO-ETHYLENE POLYMER COMPOSED OF AT LEAST 50 PERCENT BY WEIGHT OF VINYLIDENE CHLORIDE WITH ANY REMAINDER BEING AT LEAST ONE MONOETHYLENICALLY UNSATURATED COMONOMER AND FROM 0.5 TO 6 PERCENT OF THE WEIGHT OF SAID POLYMER OF A 2,4-DIHYDROXYBENZOPHENONE DERIVATIVE HAVING THE GENERAL FORMULA:
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) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |