USD253909SExpiredUtility

Refractometer

51
Assignee: AMERICAN OPTICAL CORPPriority: Jul 8, 1977Filed: Jul 8, 1977Granted: Jan 8, 1980
Est. expiryJul 8, 1997(expired)· nominal 20-yr term from priority
Inventors:John T. Armbruster
51
PatentIndex Score
4
Cited by
5
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a refractometer, as shown and described.

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