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US3475410A
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Treatment of a film of cellulose to introduce amino groups and production of non-thrombogenic surfaces on such treated cellulose films
Assignee: Massachusetts Institute of Technology
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Filing: 1967-02-08
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Granted: 1969-10-28
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Expires: 1987-02-08
Abstract
No abstract record available.
Inventors
- 👤 Robert A Britton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:35
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/12; A; A61; A61L; A61L27/00; A61L27/50; A61L27/54; A61L33/00; A61L33/0005; A61L33/0011; A61L33/0023; B01D67/00; B01D67/0081; B01D67/0093; B01D67/00931; C; C08; C08J; C08J7/00; C08J7/12; A61L2300/00; A61L2300/20; A61L2300/23; A61L2300/236; A61L2300/40; A61L2300/42; C08J2301/00; Y; Y10; Y10S; Y10S623/00; Y10S623/924
Claims Analysis
Total Claims: 0
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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) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |