US2882253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for stabilizing polyvinylpyrrolidone and compositions thereby obtained
Assignee: Dow Chemical Co
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Filing: 1955-11-16
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Granted: 1959-04-14
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Expires: 1975-11-16
Abstract
No abstract record available.
Inventors
- 👤 Theodore B Lefferdink
- 👤 Teddy G Traylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:42
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/356; D06M15/3562; C; C08; C08K; C08K5/00; C08K5/0091; C08K5/36; C08K5/41; D02; D02J; D02J1/00; D02J1/22; D02J1/223; Y; Y10; Y10S; Y10S8/00; Y10S8/04; Y10S8/92; Y10S8/922; Y10S8/924; Y10S8/927; Y10T; Y10T428/00; Y10T428/29
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
METHOD FOR STABLIZING POLYVINYLPYRROLIDONE TO LIGHT AND HEAT WHICH COMPRISES INCORPORATING BETWEEN ABOUT 0.1 AND 5.0 PERCENT BY WEIGHT OF ZINC FORMALDEHYDE SULFOXYLATE IN THE POLYVINYPYRROLIDONE.
Claim 2
Dependent Claim
26 words
METHOD FOR STABLIZING POLYVINYLPYRROLIDONE TO LIGHT AND HEAT WHICH COMPRISES INCORPORATING BETWEEN ABOUT 0.1 AND 5.0 PERCENT BY WEIGHT OF ZINC FORMALDEHYDE SULFOXYLATE IN THE POLYVINYPYRROLIDONE.
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) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |