Granted Patent
Utility
US 4,497,759 · App. 06/452,862
Drawing of polyoxymethylene using dielectric heating
Inventors:
Koichi Nakagawa, Osamu Maeda, Shinzo Yamakawa
Patented Case
View Patent ↗
Granted: Feb 5, 1985
Filed: Dec 23, 1982
Inventors
Koichi Nakagawa
Osamu Maeda
Shinzo Yamakawa
Assignee (at issue)
Nippon Telegraph and Telephone Public Corporation
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.