Heart valve stiffening ring

Details Heart valve stiffening ring Heart valve stiffening ring

1997-09-03

2003-03-18

Zarfas, Louis S. (Department: 2914)

Medical and laboratory equipment

Equipment for diagnosis, analysis, or treatment

Prosthesis or implant

Design Patent

active

D0471981

CLAIM:
The ornamental design for a heart valve stiffening ring, as shown and described.

REFERENCES:
patent: 2391632 (1945-12-01), Knight et al.
patent: 3057630 (1962-10-01), Sneed
patent: 3685059 (1972-08-01), Bokros et al.
patent: 4363142 (1982-12-01), Meyer
patent: 4425670 (1984-01-01), Figuera
patent: 4479670 (1984-10-01), Gabler
patent: 4544185 (1985-10-01), Weirich et al.
patent: 4863460 (1989-09-01), Maglardy
patent: D376206 (1996-12-01), Reif
patent: 5628789 (1997-05-01), Vanney et al.
patent: 5695503 (1997-12-01), Krueger et al.
patent: 5776188 (1998-07-01), Shepherd et al.

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