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BELKNAP DONALD J

Overview
  • Total Patents
    14
About

BELKNAP DONALD J has a total of 14 patent applications. Its first patent ever was published in 1957. It filed its patents most often in United States, Austria and Canada. Its main competitors in its focus markets electrical machinery and energy, machines and materials and metallurgy are EDISON THOMAS ALVA, BIRDSEYE ELECTRIC COMPANY and SINGER GROVER C.

Patent filings in countries

World map showing BELKNAP DONALD Js patent filings in countries
# Country Total Patents
#1 United States 10
#2 Austria 1
#3 Canada 1
#4 Switzerland 1
#5 Germany 1

Patent filings per year

Chart showing BELKNAP DONALD Js patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Belknap Donald J 12
#2 Crump Lloyd R 2
#3 Donald J Belknap 1
#4 Belknap Donald-J 1

Latest patents

Publication Filing date Title
US4027804A Lamp component transport device
US4017956A Apparatus for making incandescent lamps and the like
US4027363A Methods of making incandescent lamps
US3861896A Method for heat sealing metal sleeves to an insulated sleeve
US3914640A Incandescent lamps having preformed filament units
CH464350A Miniature incandescent lamp and process for its manufacture
US3226218A Apparatus for making microminiature incandescent lamps
US3193906A Method of making microminiature incandescent lamps
US3179848A Lateral-current control of coldcathode discharge devices
US3040204A Microminiature incandescent lamp
US2994011A Lateral-current control of coldcathode discharge devices
CA878701A Miniature incandescent lamps and the like and methods of making the same