Patent US964182A successfully refreshed from Google Patents.
Patent US3579645A successfully refreshed from Google Patents.
US3579645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cardiac valve occluder having a density approximately equal to blood
Assignee: Gulf Energy and Environmental Systems Inc
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Filing: 1969-04-30
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Granted: 1971-05-25
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Expires: 1989-04-30
Abstract
Abstract AN IMPROVED MOVABLE OCCULDER FOR INTERMITTENTLY OPENING AND CLOSING THE APERTURE IN A HEART VALVE. THE OCCLUDER HAS AN INNER SUBSTRATE PORTION AND AN EXTERIOR COATING OF A MATERIAL, SUCH AS ISOTROPIC PYROLYTIC CARBON, THAT IS CHEMICALLY NONREACTIVE WITH BLOOD. ALTHROUGH THE EXTERIOR COATING MATERIAL HAS A DENSITY GREATER THAN BLOOD, THE SUBSTRATE HAS AN APPARENT DENSITY LESS THAN BLOOD SO THAT THE COMPOSITE OCCLUDER HAS A DENSITY THAT APPROXIMATES BLOOD. THE SUBSTRATE MAY BE HOLLOW OR MADE OF A POROUS MATERIAL. AN INTERMEDIATE LAYER OF LOW DENSITY MATERIAL MAY BE EMPLOYED TO DEADEN THE SOUND.
Inventors
- 👤 Jack C Bokros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:58
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/24; A61F2/2403; A61F2/2409
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |