Inventor
LUM FRANCIS
US7 patents
⚠️ This page may combine multiple inventors who share the name “LUM FRANCIS”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
IRWIN MAGNETIC SYSTEMS INC
4 patentsUS4586094AApr 29, 1986
Method and apparatus for pre-recording tracking information on magnetic media
IRWIN MAGNETIC SYSTEMS INC84 citations94
US4472750ASep 18, 1984
Data record with pre-recorded transducer positioning signals, and system for utilizing same
IRWIN MAGNETIC SYSTEMS INC134 citations92
US4647994AMar 3, 1987
Miniaturized cartridge-type tape drive for data processors
IRWIN MAGNETIC SYSTEMS INC28 citations88
US4646175AFeb 24, 1987
Method and apparatus for positioning transducers by digital conversion of analog-type signals
IRWIN MAGNETIC SYSTEMS INC24 citations79