Patent US3609768A successfully refreshed from Google Patents.
US3609768A
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Anticoagulant material having charged electrostatic surfaces suitable for use in prosthetic devices
Assignee: Becton Dickinson and Co
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Filing: 1969-06-16
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Granted: 1971-10-05
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Expires: 1989-06-16
Abstract
Abstract AN ANTICOAGULANT DEVICE FOR CONFINING BLOOD. THE DEVICE INCLUDES A BLOOD ENGANGING WALL WITH A SURFACE FOR CONTACTING THE BLOOD. THE WALL IS FORMED OF A MATERIAL ADAPTED TO HAVE A SUBSTANTIALLY PERMANENT VOLUMETRIC CHARGE PROVIDING A BLOOD-ENGAGING SURFACE FIELD OF NOT LESS THAN APPROXIMATELY 0.3 VOLT NEGATIVE.
Inventors
- 👤 Waldemar A Ayres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:51
CPC Classifications
A; A61; A61L; A61L33/00; A61L33/0094; A61B; A61B10/00; A61B5/00; A61B5/07; A61B5/076; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |