Patent US3427301A successfully refreshed from Google Patents.
US3427301A
Expired / Lapsed
US
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Crosslinking of collagens employing a redox system comprising persulphate and a reducing agent
Assignee: United States Department of Agriculture
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Filing: 1966-04-06
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Granted: 1969-02-11
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Expires: 1986-04-06
Abstract
No abstract record available.
Inventors
- 👤 Howard L Needles
- 👤 Robert E Whitfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 23:15
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/22; D06; D06M; D06M15/00; D06M15/01; D06M15/15
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) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |