Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Voice-recognition elevator security system

Voice-recognition elevator security system

US Patent 4590604 · Granted May 20, 1986

Estimated economic value: $5,786,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Position indicating device1987
Digital, electromagnetic rod position indicator with precisely controlled transi1987
Method and apparatus for preventing inadvertent criticality in a nuclear fueled 1986
Voice-recognition elevator security system1985
Multi-line scan mark verification circuit1982
Optical path monitoring circuit for a document scanner1982
Digital video line delay circuit1981