US3666750A
Expired / Lapsed
US
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Hemostatic material
Assignee: Johnson and Johnson
•
Filing: 1969-12-15
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Granted: 1972-05-30
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Expires: 1989-12-15
Abstract
Abstract A new and improved hemostatic material formed of an oxidized cellulosic material and method for its preparation wherein an oxidized cellulosic material is treated with a borohydride under alkaline conditions.
Inventors
- 👤 Theodore S Briskin
- 👤 Allen H Remanick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:55
CPC Classifications
C; C08; C08B; C08B15/00; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; A61L2400/00; A61L2400/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
A process as defined in claim 1 wherein said borohydride is sodium borohydride.
Claim 2
Dependent Claim
19 words
A process as defined in claim 1 wherein said solution contains at least 20 percent by weight of alcohol.
Claim 3
Dependent Claim
49 words
In the method of stabilizing a hemostatic material consisting of a cellulosic pad, the improvement comprising first oxidizing said cellulosic gauze pad with nitrogen dioxide and thereafter immersing said cellulosic pad in an aqueous alcoholic solution at a pH of from 9-12 wherein said solution contains an alkali borohydride.
Claim 4
Dependent Claim
16 words
A process as defined in claim 4 wherein said nitrogen dioxide is in the liquid phase.
Claim 5
Dependent Claim
16 words
A process as defined in claim 4 wherein said nitrogen dioxide is in the gaseous phase.
References Cited (Backward Citations)
US2898333A
Cited
US3122479A
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US3032548A
Cited
US3364200A
Cited
US3478751A
Cited
US3491766A
Cited
US3516416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |