Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Didactic device to improve penmanship and drawing skills

Didactic device to improve penmanship and drawing skills

US Patent 4464118 · Granted Aug 7, 1984

Estimated economic value: $8,199,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

System to optimize the stacking efficiency of objects1997
Learning aid or game having miniature electronic speech synthesis chip1990
Method of optical character recognition1989
Method of optical character recognition1988
Signature verification1987
Method and apparatus for recognition of discontinuous text1987
Electronic handheld translator having miniature electronic speech synthesis chip1986
Variable frame length data converter for a speech synthesis circuit1984
Speech analysis circuits using an inverse lattice network1984
Interactive device for teaching musical tones or melodies1984
Speech synthesis system utilizing variable frame rate1984
Taught learning aid1984