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DUFFERS SCIENT INC

Overview
  • Total Patents
    21
About

DUFFERS SCIENT INC has a total of 21 patent applications. Its first patent ever was published in 1983. It filed its patents most often in United States, WIPO (World Intellectual Property Organization) and Canada. Its main competitors in its focus markets measurement, machine tools and electrical machinery and energy are QUANTUM DIAMOND TECH INC, MESTRA AG and HAMMERTECH AS.

Patent filings per year

Chart showing DUFFERS SCIENT INCs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Ferguson Hugo S 10
#2 Ferguson Hugo Stanley 10
#3 Stanley Ferguson H 1
#4 Hollinger David L 1

Latest patents

Publication Filing date Title
US5199304A Apparatus for optically measuring specimen deformation during material testing
US5195378A Dynamic thermal-mechanical material testing system utilizing a balanced magnetic field
US5092179A Dynamic material testing system having independent control over specimen deformation and strain rate and a method for use therein
US5202542A Test specimen/jaw assembly that exhibits both self-resistive and self-inductive heating in response to an alternating electrical current flowing therethrough
USRE34843E Signal controlled waveform recorder
WO8800104A2 Method and apparatus for measuring and controlling indentation in resistance welding
US4734555A Method and apparatus for measuring and controlling indentation in resistance welding
US4721906A One step RMS system
US4631697A Signal controlled waveform recorder
EP0125883A2 Signal controlled waveform recorder
US4509000A Bumpless feedback switching apparatus for use in a servo system