Sight glass

Details Sight glass Sight glass

2005-05-17

2005-05-17

Greene, Paula A. (Department: 2912)

Photography and optical equipment

Optical article not elsewhere specified

Lens or objective

Design Patent

active

D0505145

CLAIM:
The ornamental design of the sight glass, as shown and described.

REFERENCES:
patent: 1837085 (1931-12-01), Van Gelder
patent: 3119185 (1964-01-01), Gray
patent: 3546778 (1970-12-01), Lepkowski
patent: D268594 (1983-04-01), Chyba
patent: 4968125 (1990-11-01), Rodriquez
patent: D334940 (1993-04-01), Wolinsky
patent: D363300 (1995-10-01), Schwartz

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