Inventor

HEWITT MARTIN

US7 patents

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

PARKER HANNIFIN CORP

2 patents

US5996407ADec 7, 1999

Multi-frequency ultrasonic liquid level gauging system

PARKER HANNIFIN CORP46 citations90

US7418860B2Sep 2, 2008

Ultrasonic fluid level sensor

PARKER HANNIFIN CORP28 citations89

SCHOOL SPECIALTY LLC

2 patents

USD990901SJul 4, 2023

Stacking stool

SCHOOL SPECIALTY LLC4 citations66

USD988735SJun 13, 2023

Stacking stool

SCHOOL SPECIALTY LLC2 citations64

ANSAFONE LTD

2 patents

US4004276AJan 18, 1977

Telephone answering machines

ANSAFONE LTD9 citations64

US4134141AJan 9, 1979

Recording and reproducing means

ANSAFONE LTD0 citations42

SMITHS INDUSTRIES LTD

1 patent

US4262531AApr 21, 1981

Fluid-gauging methods and systems

SMITHS INDUSTRIES LTD18 citations71