Learn more

PERWAS LUDWIG F

Overview
  • Total Patents
    19
About

PERWAS LUDWIG F has a total of 19 patent applications. Its first patent ever was published in 1941. It filed its patents most often in United States, Canada and Germany. Its main competitors in its focus markets consumer goods, measurement and machines are STEIN HUGO, DRUMM ARTHUR E and REMENAR DAMIR.

Patent filings in countries

World map showing PERWAS LUDWIG Fs patent filings in countries
# Country Total Patents
#1 United States 16
#2 Canada 2
#3 Germany 1

Patent filings per year

Chart showing PERWAS LUDWIG Fs patent filings per year from 1900 to 2020

Focus industries

Top inventors

# Name Total Patents
#1 Perwas Ludwig F 18
#2 F Perwas Ludwig 1

Latest patents

Publication Filing date Title
US3458938A Center-line gauges
US3426436A Projected measuring surface gage blocks
US3180029A Height gages
US2914857A Tubular telescoping micrometer height gages
US2834975A Pocket toothbrush with removable brush head
US2707295A Fountain toothbrush
US2489976A Fountain pen pumping element
US2476321A Fountain pen
US2449567A Fountain pen
US2474860A Powder dispensing toothbrush holder
US2599658A Manually operated pressure feed fountain toothbrush
US2544857A Pressure feed fountain brush
US2631762A Pressure actuated fountain toothbrush
US2507419A Fountain toothbrush having builtin air pump for feeding dentifrice from reservoir tobristles
US2547834A Reservoir handle for fountain brush having piston means for filling and dispensing
US2317111A Toothbrush cover fastener
CA480808A Dispensing toothbrush holder
CA747601A Height gauges