P

Inventor

LIGTENBERG CHRISTIAAN

US9 patents
⚠️ This page may combine multiple inventors who share the name “LIGTENBERG CHRISTIAAN”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

LEVELITE TECHNOLOGY INC

4 patents
US5459932AOct 24, 1995

Automatic level and plumb tool

LEVELITE TECHNOLOGY INC148 citations98
US5619802AApr 15, 1997

Automatic level and plumb tool

LEVELITE TECHNOLOGY INC89 citations96
US5524352AJun 11, 1996

Automatic level and plumb tool

LEVELITE TECHNOLOGY INC72 citations96
US6005716ADec 21, 1999

Co-linear and intersecting five light beam generator

LEVELITE TECHNOLOGY INC49 citations92

Q R SPEX INC

1 patent
US7331666B2Feb 19, 2008

Eyewear with a mounted radio frequency transceiver

Q R SPEX INC145 citations97

QR SPEX INC

1 patent
US6769767B2Aug 3, 2004

Eyewear with exchangeable temples housing a transceiver forming ad hoc networks with other devices

QR SPEX INC267 citations97

(unassigned)

1 patent
US5541727AJul 30, 1996

Automatic level and plumb tool

74 citations96

SWAB GREGORY

1 patent
US9244292B2Jan 26, 2016

Eyewear with exchangeable temples housing a radio frequency transceiver

SWAB GREGORY51 citations94

APPLE COMPUTER

1 patent
US7092254B1Aug 15, 2006

Cooling system for electronic devices utilizing fluid flow and agitation

APPLE COMPUTER67 citations94