Inventor

OHTSUKA TETSUSHI

JP4 patents

⚠️ This page may combine multiple inventors who share the name “OHTSUKA TETSUSHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

SEKISUI CHEMICAL CO LTD

2 patents

US6298870B1Oct 9, 2001

Vacuum-operated sewage system and air inlet valve

SEKISUI CHEMICAL CO LTD9 citations71

US7950911B2May 31, 2011

Single stage root type-vacuum pump and vacuum fluid transport system employing the single stage root type-vacuum pump

SEKISUI CHEMICAL CO LTD4 citations52

SEIKISUI CHEMICAL CO LTD

1 patent

US5615701AApr 1, 1997

Vacuum valve control device and vacuum valve

SEIKISUI CHEMICAL CO LTD31 citations89

SEIKISUI KAGAKU KOGYO KABUSHIK

1 patent

US5918853AJul 6, 1999

Vacuum valve control device and vacuum valve

SEIKISUI KAGAKU KOGYO KABUSHIK16 citations78