Inventor
TAKEMATSU HIKARU
7 patents
⚠️ This page may combine multiple inventors who share the name “TAKEMATSU HIKARU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
IWATSU ELECTRIC CO LTD
6 patentsUS4092501AMay 30, 1978
Key telephone system
IWATSU ELECTRIC CO LTD9 citations72
US4027110AMay 31, 1977
Key telephone system
IWATSU ELECTRIC CO LTD6 citations61
US4234765ANov 18, 1980
Key telephone system
IWATSU ELECTRIC CO LTD5 citations57
US4353066AOct 5, 1982
Channel switching network
IWATSU ELECTRIC CO LTD2 citations56
US4280022AJul 21, 1981
Key telephone systems
IWATSU ELECTRIC CO LTD6 citations56
US4011415AMar 8, 1977
Call circuit for key telephone system for giving direct station selection call priority over station call
IWATSU ELECTRIC CO LTD1 citations49