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HOLZAPFEL JOHN A

Overview
  • Total Patents
    11
About

HOLZAPFEL JOHN A has a total of 11 patent applications. Its first patent ever was published in 1922. It filed its patents most often in United States and Canada. Its main competitors in its focus markets transport and machines are INTERNAT MARINE AND OIL DEV CO, CORRECT CRAFT INC and ISHERWOOD JOSEPH WILLIAM.

Patent filings in countries

World map showing HOLZAPFEL JOHN As patent filings in countries
# Country Total Patents
#1 United States 10
#2 Canada 1

Patent filings per year

Chart showing HOLZAPFEL JOHN As patent filings per year from 1900 to 2020

Focus industries

# Industry
#1 Transport
#2 Machines

Focus technologies

# Technology
#1 Ships
#2 Unspecified technologies

Top inventors

# Name Total Patents
#1 Holzapfel John A 11

Latest patents

Publication Filing date Title
US1674436A Anchor-rope pulley
US1613107A Anchor
US1493492A Anchor-rope pulley
US1479813A Anchor-rope pulley
US1493490A Rope holder
US1494546A Wringer for anchor ropes
US1493491A Anchor-rope wringer and pulley
US1494545A Anchor
US1432185A Wringer for anchor ropes
US1493489A Anchor
CA229642A Wringer for anchor ropes