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4,139,743, 02/13/1979 Headset - Flygstad, Dean W.
4,147,904, 04/03/1979 Microphone with channel selector and push-to-talk button interlock - Carpenter; Michael P. (Robbinsdale, MN); D'Amico; Paul M. (Bloomington, MN)
4,171,082, 10/16/1979 Tape guide - Flygstad; Dean W. (St. Paul, MN); Aronoff; Michael I. (Minneapolis, MN)
4,190,782, 02/26/1980 Piezoelectric ceramic resonant transducer with stable frequency - Guess; Joe F. (Cedar Rapids, IA)
4,193,647, 03/18/1980 Piezoelectric ceramic transducers with uniform resonant frequency - Guess; Joe F. (Cedar Rapids, IA); Gastmeier; William J. (Stratford, CA)
4,216,507, 08/05/1980 Automatic tape player-changer - Flygstad; Dean W. (St. Paul, MN); Petelle; James F. (Hopkins, MN)
4,293,955, 10/06/1981 Diversity reception system - Gehr; Marvin M. (Lincoln, NE); Pabian; Howell D. (Lincoln, NE)
4,324,355, 04/19/1982 Mechanism for retracting the pressure rollers of a tape transport when the power is off - Dust; James A. (Minnetonka, MN)
4,352,199, 09/28/1982 Method and device for detecting and interpreting a distress signal - Rogard; Roger (Verdistraat 16, 2162 AV - Lisse, NL)
4,415,244
, Automatic focusing system
D271,692, 12/06/1983 Casing for auditory trainer receiver - Morris; Wayne E. (Brooklyn Park, MN)
4,447,836, 05/08/1984 Recording apparatus for cassette copying - Flygstad; Dean W. (St. Paul, MN); Wehrmacher; Bill H. (Prior Lake, MN)
4,604,628, 08/05/1986 Parasitic array with driven sleeve element - Cox; Roger A. (Lincoln, NE)
4,701,640, 10/20/1987 Electret transducer and method of fabrication - Flygstad; Dean W. (Apple Valley, MN); Tromborg; Craig E. (Bloomington, MN)
4,718,099, 01/05/1988 Automatic gain control for hearing aid - Hotvet; David A. (Savage, MN)
4,726,068, 02/16/1988 Boom mounted microphone and connector - Wiegel; Christopher D. (Minneapolis, MN)
4,727,585, 02/22/1988 Adjustable tension support band for headset - Flygstad; Dean W. (Apple Valley, MN)
4,747,145, 04/24/1988 Earcup suspension for headphone - Wiegel; Christopher D. (Minneapolis, MN)
4,748,671, 05/31/1988 Microphone boom hinge - Wiegel; Christopher D. (Minneapolis, MN)
D299,129, 12/27/1988 Headphone earpiece - Wiegel; Christopher D. (Minneapolis, MN)
D299,335, 01/10/1989 Microphone - Wiegel; Christopher D. (Minneapolis, MN)
D299,337, 01/10/1989 Headset - Wiegel; Christopher D. (Minneapolis, MN)
D299,338, 01/10/1989 Microphone boom hinge - Wiegel; Christopher D. (Minneapolis, MN)
4,944,578, 07/31/1990 Color graphic imager utilizing a liquid crystal display - Denison; William W. (Edina, MN)
D317,525, 06/18/1991 Band for headset - Wiegel; Christopher D. (Minneapolis, MN)
5,029,238, 07/02/1991 Noise suppression circuit - Gehr; Marvin M. (Lincoln, NE)
5,097,224, 03/17/1992 Self-biasing, low noise amplifier of extended dynamic range - Madaffari; Peter L. (Camden, ME); Wurtz; Michael J. (Edina, MN)
5,182,774, 01/26/1993 Noise cancellation headset - Bourk; Terrance R. (San Diego, CA)
D333,137, 02/09/1993 Headset - Burke; Jonathan C. (Larkspur, CA)
D345,981
, 04/12/1994 Headset - Burke; Jonathan C. (Larkspur, CA)
D357,477, 04/18/1995 Headset - Mueller; Eric (Minneapolis, MN); Rothstein; Paul (Minneapolis, MN)
D363,487, 10/24/1995 Headset ear piece - Thurnau; Kevin C. (Faribault, MN)
D365,564, 12/26/1995 Microphone - Luther; James (Minneapolis, MN); Fujikawa; Norio (Minneapolis, MN)
5,483,528, 01/09/1996 TDM digital matrix intercom system - Christensen; Steven G. (Minneapolis, MN)
D366,486, 01/23/1996 Headset - Runquist; Lars (St. Paul, MN); Copeland; David J. (Minneapolis, MN)
D368,719, 04/09/1996 Microphone - Luther; James (Minneapolis, MN)
5,568,205
, 10/22/1996 Camera mounted wireless audio/video transmitter system - Hurwitz; James (San Francisco, CA)
D377,174, 01/07/1997 Aircraft headset - Runquist; Lars (St. Paul, MN)
D379,185, 05/13/1997 Microphone - Luther; James (Minneapolis, MN); Fujikawa; Norio (Minneapolis, MN)
5,639,152, Collapsible LCD projector
D386,764, 11/25/1997 Microphone - Lake; Thomas (Eagan, MN)
D389,153, 01/13/1998 Microphone attachable to computer monitor - Litzau; Eugene D. (New Prague, MN)
D395,893,
07/07/1998 Microphone - Hern; Matthew D. (San Francisco, CA); Bradley; Paul (Woodside, CA); Lake; Tom (Eagan, MN); Carpenter; Mike (Brooklyn Park, MN)
D395,894, 07/07/1998 Microphone - Hern; Matthew D. (San Francisco, CA); Bradley; Paul (Woodside, CA); Lake; Tom (Eagan, MN); Carpenter; Mike (Brooklyn Park, MN)
5,802,183, 09/01/1998 BTE assistive listening receiver with interchangeable crystals - Scheller; Tom (Fridley, MN); Posner; Scott (Eden Prairie, MN); Johnson; Art (Lakeville, MN); Henry; Pat (Eagan, MN); Teske; Irene (Farmington, MN); Gilbertson; Mark A. (Sauk City, WI)
D401,241, 11/17/1998 Speaker enclosure - Runquist; Lars (Grove Heights, MN); Copeland; David (Minneapolis, MN)
5,862,241, 01/19/1999 Adjustable headset - Nelson; Brian (Birchwood, MN)
5,883,804, 03/16/1999 Modular digital audio system having individualized functional modules - Christensen; Steven G. (Minneapolis, MN)
5,903,655, 05/11/1999 Compression systems for hearing aids - Salmi; Peter T. (Minneapolis, MN); Scheller; Thomas A. (Fridley, MN)
5,970,159, 10/19/1999 Video monitor with shielded microphone - McIntosh; Jason (Savage, MN)
6,069,878, 05/30/2000 TDM digital matrix intercom system - Christensen; Steven G. (Minneapolis, MN)
D443,870, 06/19/2001 Headset - Carpenter; Michael (Brooklyn Park, MN); Wright; Gregory (Savage, MN); Runquist; Lars (Inver Grove Heights, MN); Copeland; David (Minneapolis, MN)
D444,143
, 06/26/2001 Microphone - Andreini; Michael (Stillwater, MN); Carpenter; Michael (Brooklyn Park, MN); Pham; Hoa (St. Paul, MN); Wright; Gregory (Savage, MN)
6,256,484, 07/03/2001 Diversity reception system - Conner; Charles E. (Lincoln, NE); Basine; Robert B. (Waverly, NE)
6,278,786, 08/21/2001 Active noise cancellation aircraft headset system - McIntosh; Jason D. (Weston, FL)
D448,751,10/02/2001 Earphone headset - Pham; Hoa (St. Paul, MN); Carpenter; Michael (Brooklyn Park, MN)
D449,038, 10/09/2001Headset - Andreini; Michael (Stillwater, MN); Pham; Hoa (St. Paul, MN); Carpenter; Michael (Brooklyn Park, MN)
6,373,951
, 04/16/2002 Synchronization technique and method and apparatus for transmitting and receiving coded signals - Jenkins; Keith E. (Lincoln, NE); Basine; Robert B. (Waverly, NE); Friesen; LaRhue G. (Lincoln, NE)
6,483,476, One-piece Yagi-Uda antenna and process for making the same
6,496,589, 12/17/2002 Headset with overmold - Pham; Hoa (St. Paul, MN); Carpenter; Michael (Brooklyn Park, MN)
D467,571, 12/24/2002 Surface mountable loudspeaker - Whitehouse; Ryan Paul (Eagan, MN); Beckett; Christopher Sean (Minneapolis, MN); Mora; Robert E. (Worthington, OH)
D468,723, 01/14/2003 Earphone headset - Pham; Hoa (Woodbury, MN); Lardy; Jason (Minneapolis, MN)
D469,770, 02/04/2003 Headset signal converter pod - Carpenter; Michael (Brooklyn Park, MN); Pham; Hoa (Woodbury, MN); Lardy; Jason (Minneapolis, MN)
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