Inventor

LIGMAN JAMES R

US8 patents

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

KKF CORP

1 patent

US4206491AJun 3, 1980

Entry system

KKF CORP79 citations94

PHASE III

1 patent

US5828200AOct 27, 1998

Motor control system for variable speed induction motors

PHASE III151 citations93

BETTER CLEANING SYSTEM INC

1 patent

US5555595ASep 17, 1996

Carpet cleaner unit with adjustable power control

BETTER CLEANING SYSTEM INC55 citations92

PIEZO SONA TOOL CORP

1 patent

US4658897AApr 21, 1987

Downhole transducer systems

PIEZO SONA TOOL CORP40 citations91

GEN AQUADYNE INC

1 patent

US4009419AFeb 22, 1977

Safety circuit for video diver

GEN AQUADYNE INC24 citations80

SONA TOOL DEV LTD

1 patent

US4512402AApr 23, 1985

Casing tuned downhole tool

SONA TOOL DEV LTD26 citations78

KDC CORP

1 patent

US4737767AApr 12, 1988

Solid state keyboard

KDC CORP6 citations60

CASABLANCA FAN COMPANY INC

1 patent

US4658197AApr 14, 1987

Motor control circuit

CASABLANCA FAN COMPANY INC1 citations51