USD335337SExpiredUtility

Heat exchanger for fuel fired furnaces

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Assignee: RHEEM MFG COPriority: May 18, 1990Filed: May 18, 1990Granted: May 4, 1993
Est. expiryMay 18, 2010(expired)· nominal 20-yr term from priority
Inventors:Timothy J. Shellenberger
43
PatentIndex Score
4
Cited by
12
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a heat exchanger for fuel fired furnaces, as shown and described.

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