Dale T. Tollefson

Person

Woodbury, MN, US

People

Patents Grantslast 30 patents

Information Patent Grant
Reel spring for a thin-walled videocassette
- Patent number 5,484,117
- Issue date Jan 16, 1996
- Minnesota Mining and Manufacturing Company
- Dale T. Tollefson
- G11 - INFORMATION STORAGE
Information Patent Grant
Tapered reel pressure spring
- Patent number 5,332,172
- Issue date Jul 26, 1994
- Minnesota Mining and Manufacturing Company
- Dale T. Tollefson
- G11 - INFORMATION STORAGE
Information Patent Grant
Plastic tape guide for videocassette
- Patent number 5,074,451
- Issue date Dec 24, 1991
- Minnesota Mining and Manufacturing Company
- Dale T. Tollefson
- G11 - INFORMATION STORAGE
Information Patent Grant
Tape cassette with tape leader detection improvements
- Patent number 4,993,661
- Issue date Feb 19, 1991
- Minnesota Mining and Manufacturing Company
- Dale T. Tollefson
- G11 - INFORMATION STORAGE
Information Patent Grant
Slack limiter for a magnetic tape cassette
- Patent number 4,813,628
- Issue date Mar 21, 1989
- Minnesota Mining and Manufacturing Company
- Dale T. Tollefson
- G11 - INFORMATION STORAGE
Information Patent Grant
Plastic supply tape guide for videocassette
- Patent number 4,745,508
- Issue date May 17, 1988
- Minnesota Mining and Manufacturing Company
- Dale T. Tollefson
- G11 - INFORMATION STORAGE
Information Patent Grant
Leaf-spring roller guide
- Patent number 4,648,563
- Issue date Mar 10, 1987
- Minnesota Mining and Manufacturing Company
- Dale T. Tollefson
- G11 - INFORMATION STORAGE

Dale T. Tollefson

Person

Patents Grantslast 30 patents

Reel spring for a thin-walled videocassette

Tapered reel pressure spring

Plastic tape guide for videocassette

Tape cassette with tape leader detection improvements

Slack limiter for a magnetic tape cassette

Plastic supply tape guide for videocassette

Leaf-spring roller guide