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SHEFFIELD TWIST DRILL & STEEL

Overview
  • Total Patents
    39
About

SHEFFIELD TWIST DRILL & STEEL has a total of 39 patent applications. Its first patent ever was published in 1954. It filed its patents most often in United Kingdom, France and United States. Its main competitors in its focus markets machine tools, machines and measurement are NAT OPTRONICS INC, COLE NATIONAL CORP and MOTOR TOOL MFG COMPANY.

Patent filings in countries

World map showing SHEFFIELD TWIST DRILL & STEELs patent filings in countries
# Country Total Patents
#1 United Kingdom 14
#2 France 10
#3 United States 8
#4 Switzerland 3
#5 Germany 3
#6 Sweden 1

Patent filings per year

Chart showing SHEFFIELD TWIST DRILL & STEELs patent filings per year from 1900 to 2020

Focus industries

Top inventors

# Name Total Patents
#1 Bramhall John Michael 5
#2 Webster John Samuel 4
#3 William Turner 3
#4 Pepper Herbert 3
#5 Michael Bramhall John 3
#6 Samuel Webster John 2
#7 Turner William 2
#8 Adolph Sargrove John 2
#9 John Adolph Sargrove 1
#10 Mcgregor John 1

Latest patents

Publication Filing date Title
US3456392A Twist drill grinding machines
GB1135251A Improvements in machines for grinding twist drills
GB1085089A Improvements in twist drill grinding machines
GB1109259A An improvement in or relating to milling cutters
GB1068656A Improvements in chucks for milling machine cutters
GB1061900A Improvements in or relating to scale marking apparatus
GB1067698A Improvements in and relating to tool holders or chucks for rotary tools
GB1003175A Improvements in or relating to rotary cutting tools
GB951282A Improvements in or relating to rotary cutting tools
GB981876A Improvements in and relating to measuring or control apparatus
US2915858A Device for use in grinding twist drills
GB864524A A new or improved device for use in grinding twist drills
GB798525A Improvements in and relating to chucks or tool holders for milling machine cutters and like rotary tools
GB803797A Improvements in and relating to arbors for milling machine cutters and like rotary tools
US2728251A Improved vise having jaws movable downwardly when clamping a workpiece
GB762621A An improved milling machine cutter arbor, and means for securing the cutter to the arbor