Inventor
TOLLEFSON DALE T
US7 patents
Patents
7 patentsUS4993661AFeb 19, 1991
Tape cassette with tape leader detection improvements
MINNESOTA MINING & MFG18 citations71
US4745508AMay 17, 1988
Plastic supply tape guide for videocassette
MINNESOTA MINING & MFG10 citations71
US5074451ADec 24, 1991
Plastic tape guide for videocassette
MINNESOTA MINING & MFG9 citations67
US5332172AJul 26, 1994
Tapered reel pressure spring
MINNESOTA MINING & MFG3 citations60
US4813628AMar 21, 1989
Slack limiter for a magnetic tape cassette
MINNESOTA MINING & MFG3 citations60
US4648563AMar 10, 1987
Leaf-spring roller guide
MINNESOTA MINING & MFG5 citations60
US5484117AJan 16, 1996
Reel spring for a thin-walled videocassette
MINNESOTA MINING & MFG1 citations49