USD343382SExpiredUtility

Frequency inverter

83
Assignee: HITACHI LTDPriority: Nov 1, 1991Filed: Mar 2, 1992Granted: Jan 18, 1994
Est. expiryNov 1, 2011(expired)· nominal 20-yr term from priority
Inventors:Shigehisa HaguraToshihiko WadaTadao ShimotsuNorinaga Suzuki
83
PatentIndex Score
26
Cited by
4
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a frequency inverter, as shown.

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