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WASH OVERSHOT AND SPEAR ENGINE

Overview
  • Total Patents
    11
About

WASH OVERSHOT AND SPEAR ENGINE has a total of 11 patent applications. Its first patent ever was published in 1953. It filed its patents most often in United States and Canada. Its main competitors in its focus markets civil engineering and machines are CONDRA ELMO L, DODDS REDUS D and SMITH INT NORTH SEA.

Patent filings in countries

World map showing WASH OVERSHOT AND SPEAR ENGINEs patent filings in countries
# Country Total Patents
#1 United States 10
#2 Canada 1

Patent filings per year

Chart showing WASH OVERSHOT AND SPEAR ENGINEs patent filings per year from 1900 to 2020

Focus industries

# Industry
#1 Civil engineering
#2 Machines

Focus technologies

# Technology
#1 Earth drilling
#2 Unspecified technologies

Top inventors

# Name Total Patents
#1 Bus Sr Franklin L Le 8
#2 Cecil Ware 5
#3 Lebus Sr Franklin L 1
#4 Lebus Franklin L Sr 1
#5 Cox Jesse J 1

Latest patents

Publication Filing date Title
US3082831A Combined wash-over and well tubing retriever apparatus
US3070170A Ball latch wash-over spear apparatus
US3003561A Free wheeling wash-over spear mechanism
US2965183A Fishing tool apparatus for well bores
US2965177A Fishing tool apparatus
US2955655A Wash-over spear mechanism
US2887161A Combined fishing tool and reaming apparatus
US2921630A Hydraulic drill collar retrieving mechanism
US2804151A Drill collar retrieving mechanism
US2817555A Method and system of retrieving stuck pipe joints in well bores
CA612751A Drill collar retrieving mechanism