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HARREL INC

Overview
  • Total Patents
    17
About

HARREL INC has a total of 17 patent applications. Its first patent ever was published in 1959. It filed its patents most often in United States. Its main competitors in its focus markets machines, control and measurement are SUZHOU LIZHU MACHINERY CO LTD, SUZHOU YUDU MEDICAL DEVICES CO LTD and SHANGHAI SUNNY CO.

Patent filings in countries

World map showing HARREL INCs patent filings in countries
# Country Total Patents
#1 United States 17

Patent filings per year

Chart showing HARREL INCs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Harris Holton E 15
#2 Darling Horace E 1
#3 Alger T 1
#4 Alger Trygve O 1

Latest patents

Publication Filing date Title
US7648658B2 Alternate polymer extrusion method with reduced drool
US7018191B2 Plastics extruder dimension and viscosity control system
US6652785B1 Operatorless extrusion system
US5725814A Extrusion of an article of varying content
US5695789A Apparatus for extrusion of an article of varying content
US4954719A Sheet thickness gauging method and system with auto calibration
US4734922A Nuclear gauge traverse
US4613471A Extruded plastic foam density control system and method
US4721589A Extruder viscosity control system and method
US4430698A Three-mode process control
US4272466A System and method of temperature control for plastics extruder
US4209476A Method and apparatus for fabrication of extruded articles
US3824479A Controller with digital integration
US3636540A Temperature control alarm system
US3351280A Temperature program apparatus
US3337811A Magnetic amplifier
US3204172A Semiconductor controlled rectifier circuits