Sight glass

Details Sight glass Sight glass

2007-03-13

2007-03-13

Greene, Paula A. (Department: 2912)

Photography and optical equipment

Optical article not elsewhere specified

Lens or objective

CD16S130000

Design Patent

active

29235089

CLAIM:
The ornamental design for a sight glass, as shown and described.

REFERENCES:
patent: 1340369 (1920-05-01), Boughton
patent: 2312542 (1943-03-01), Goodman
patent: 2538502 (1951-01-01), Boehm
patent: 2679912 (1954-06-01), Kennedy
patent: D227408 (1973-06-01), Hotchkiss
patent: 4176480 (1979-12-01), Euzarraga et al.
patent: D259083 (1981-05-01), Riegsecker
patent: 4547986 (1985-10-01), Sherman
patent: 5189820 (1993-03-01), Komamura
patent: 5596829 (1997-01-01), Komamura
patent: 5950288 (1999-09-01), Bach Lahor
patent: 6055757 (2000-05-01), Carlsson

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