Granted Patent
Utility
US 5,488,344 · App. 07/971,000
Toroidal transformer insulation preforms
Inventors:
Philip I. Bisbee, James D. Richerson, Stephen D. Smith, Eric S. Richardson
Patented Case
View Patent ↗
Granted: Jan 30, 1996
Filed: Nov 3, 1992
Inventors
Philip I. Bisbee
James D. Richerson
Stephen D. Smith
Eric S. Richardson
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.