Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Photo-optical keyboard having n-key rollover

Photo-optical keyboard having n-key rollover

US Patent 4278965 · Granted Jul 14, 1981

Estimated economic value: $3,201,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Emergency lighting system2023
LED-based emergency lighting equipment and methodology2022
Programmable emergency lighting device including near-field communication2021
Emergency lighting system2021
LED-based emergency lighting equipment and methodology2020
Wall pack luminaire and thermal insert for luminaires2020
Programmable emergency lighting device including near-field communication2020
Emergency lighting system2019
Programmable emergency lighting device including near-field communication2018
Emergency system with brown-out detection2017
LED-based emergency lighting equipment and methodology2017
System and apparatus with self-diagnostic and emergency alert voice capabilities2011