USD342131SExpiredUtility
Oil burner preheater unit
Individually held — no corporate assignee on recordPriority: Jul 19, 1991Filed: Jul 19, 1991Granted: Dec 7, 1993
Est. expiryJul 19, 2011(expired)· nominal 20-yr term from priority
Inventors:Lloyd Westenberg
17
PatentIndex Score
2
Cited by
5
References
1
Claims
Claims
exact text as granted — not AI-modifiedThe ornamental design for an oil burner preheater unit, as shown.
Join the waitlist — get patent alerts
Track USD342131S — get alerts on status changes and closely related new filings.
We store only your email — no account needed. See our privacy policy.