US3520949A
Expired / Lapsed
US
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Hydrophilic polymers,articles and methods of making same
Assignee: National Patent Development Corp
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Filing: 1966-07-26
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Granted: 1970-07-21
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Expires: 1986-07-26
Abstract
No abstract record available.
Inventors
- 👤 Thomas H Shepherd
- 👤 Francis E Gould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:14
CPC Classifications
A; A61; A61Q; A61Q11/00; A01; A01N; A01N25/00; A01N25/08; A01N25/10; A23; A23L; A23L27/00; A23L27/70; A23L27/74; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/24; A61K8/72; A61K8/81; A61K8/8141; A61K8/8152; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2027; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A61L17/00; A61L17/14; A61L17/145; A61L9/00; A61L9/015; A61L9/04; A61L9/042; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/20; C09; C09D; C09D4/00; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; A61K2800/00; A61K2800/40; A61K2800/56; Y; Y10; Y10S; Y10S521/00; Y10S521/905; Y10S525/00; Y10S525/93; Y10S525/934; Y10S525/937
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3322731A
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US3278639A
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |