Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Electrical device with alternative battery power supplies

Electrical device with alternative battery power supplies

US Patent 5331212 · Granted Jul 19, 1994

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Hand-held sound generating device1997
Successive image display device1996
Stereoscopic/monoscopic video display system1996
Interactive audio visual work1995
Interactive audiovisual board1995
Interactive audiovisual apparatus1995
Electronic book1994
Electronic musical instrument with sound-control panel and keyboard1993
Interactive audio visual work1993
Interactive audio-visual puzzle1992
Toy piano1991
Doll with sensing switch1989