PRINCETON APPLIED RESEARCH CORPORATION Trademarks
SYNCHRO-HET
Filed: April 4, 1973
LOCK-IN AMPLIFIERS-NAMELY, SPECIALIZED PHASE SENSITIVE AC VOLTMETERS USED TO MEASURE LOW-LEVEL SIGNALS OBSCURED BY NOISE
Owned by: PRINCETON APPLIED RESEARCH CORPORATION
Serial Number: 72453496
CRYSTAL-HET
Filed: August 15, 1978
ELECTRONIC ACCESSORY FOR LOCK-IN AMPLIFIER-NAMELY, A CONTINUOUSLY TRACKING TUNED AMPLIFIER
Owned by: PRINCETON APPLIED RESEARCH CORPORATION
Serial Number: 73182245
