Learn more

HEPWORTH & GRANDAGE LTD

Overview
  • Total Patents
    144
About

HEPWORTH & GRANDAGE LTD has a total of 144 patent applications. Its first patent ever was published in 1925. It filed its patents most often in United Kingdom, France and Germany. Its main competitors in its focus markets engines, pumps and turbines, mechanical elements and materials and metallurgy are SAKAKIBARA SHIGEKADO, WELLWORTHY LTD and ERNST MAHLE.

Patent filings per year

Chart showing HEPWORTH & GRANDAGE LTDs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Wells Alan 6
#2 Robinson James Eustace 6
#3 Cockcroft Frederick Edward 6
#4 Grimshaw Rex William 4
#5 Hylton Leslie 3
#6 Willmer Peter Lawrence 3
#7 Duree Jeffrey 3
#8 Sutherland A 3
#9 Poole Colin 3
#10 Cockcroft F E 3

Latest patents

Publication Filing date Title
GB8927125D0 Pistons
GB8926717D0 Piston rings
GB8912288D0 Casting die
GB8907329D0 Piston rings
GB8828028D0 Piston rings
GB8800742D0 Piston rings
GB8730172D0 Piston ring
GB1595280A Composite materials and methods for their production
GB1583349A Pistons
NZ184707A Light metal piston with two expansion control inserts, each insert having an upper band, and a lower band
GB1582140A Light metal pistons
AU1514676A Piston rings & spacer element
NZ181246A Piston rings
GB1569312A Apparatus for measuring tangential load
GB1561788A Piston rings
US4053165A Oil ring design
GB1505148A Pistons
GB1501742A Piston rings
US3947562A Production of a form of alumina whiskers
IT1032129B Flexible support ring with axial spacer bars - radially prestresses and locates two piston ring elements