Sight glass

Details Sight glass Sight glass

2006-09-26

2006-09-26

Greene, Paula A. (Department: 2912)

Photography and optical equipment

Optical article not elsewhere specified

Lens or objective

Design Patent

active

D0529061

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

REFERENCES:
patent: 374645 (1887-12-01), Watkins
patent: 2312542 (1943-03-01), Goodman
patent: 2450330 (1948-09-01), De Giers
patent: 2538502 (1951-01-01), Boehm
patent: 3935656 (1976-02-01), Pritchard
patent: 4176480 (1979-12-01), Euzarraga et al.
patent: 4282668 (1981-08-01), Jolkovski
patent: 5950288 (1999-09-01), Bach Lahor
patent: 6055757 (2000-05-01), Carlsson

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