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

29235090

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: 4282668 (1981-08-01), Jolkovski

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