Filter material

Details Filter material Filter material

2000-02-18

2001-04-24

Spear, Robert M. (Department: 2913)

Beds

Sofa bed

Bed element

Design Patent

active

D0440772

CLAIM:
The ornamental design for a filter material, as shown and described.

REFERENCES:
patent: D. 34028 (1901-02-01), Ault
patent: D. 114051 (1939-03-01), Winkel
patent: D. 384820 (1997-10-01), Choi
patent: D. 429074 (2000-08-01), Hurst et al.
patent: 673041 (1901-04-01), Ault
patent: 1441327 (1923-01-01), Blum
patent: 2834809 (1958-05-01), Schutte et al.
patent: 2858247 (1958-10-01), De Swart
patent: 2878553 (1959-03-01), Hirsch
patent: 3190412 (1965-06-01), Rutter et al.
patent: 4483728 (1984-11-01), Bauernfeind
patent: 4999235 (1991-03-01), Lunn et al.
patent: 5202180 (1993-04-01), Watts
Plaid—34% Open Grille Pattern, The Harrington & King Perforating Co. Catalog, p. 141, Dec. 1982.

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