Granted Patent
Utility
US 4,690,486 · App. 06/728,127
Four position interlacing apparatus
Inventors:
Walter F. Roll, Michael J. Campbell
Patented Case
View Patent ↗
Granted: Sep 1, 1987
Filed: Apr 29, 1985
Inventors
Walter F. Roll
Michael J. Campbell
Assignee (at issue)
Texas Instruments Incorporated
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.