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KEYSTONE IND INC

Overview
  • Total Patents
    64
About

KEYSTONE IND INC has a total of 64 patent applications. Its first patent ever was published in 1966. It filed its patents most often in United States, Canada and South Africa. Its main competitors in its focus markets transport, civil engineering and mechanical elements are KARL SCHARFENBERG, BOLDYREV ALEKSEJ PETROVICH and GOLOVACh Oleg Nikolaevich.

Patent filings in countries

World map showing KEYSTONE IND INCs patent filings in countries

Patent filings per year

Chart showing KEYSTONE IND INCs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Hawthorne V 21
#2 Hawthorne Vaughn T 9
#3 Scott Mark P 8
#4 Brough Steve A 7
#5 Lucas Anthony L 6
#6 Huggins Russell J 4
#7 Sheesley Jay R 3
#8 Van Auken Charles L 3
#9 Deppen John F 2
#10 Smith Allen D 2

Latest patents

Publication Filing date Title
CA2251039A1 Railway car outlet gate assembly with compact inertial latch
CA2249767A1 Railway car outlet gate assembly
EP0855534A2 Rail car buffer and method
US6012397A Railway car outlet gate assembly with inertial latch
US5927523A Rail car buffer
US5908123A Rail car buffer and method
US5746335A Double acting center-of-car cushioning device
US5598937A Slackless drawbar assembly
US5584251A Railway car outlet gate assembly with automatic lock
US4601461A Lading protection device
US4562929A Backstop assembly for use with cushioning device in sill of railway car
US4534298A Lock and seal for hopper outlet
US4312607A Pellet gate for pneumatic discharge hopper car
US4304338A Center-of-car cushioning device with gas return
US4224879A Railway hopper car door latch
US4033616A Automotive vehicle door retarding and closing mechanism
ZA7502264B Railway car cushioning apparatus
US4026418A Hydraulic cushioning unit with a gas return
US3910418A Railway car cushioning apparatus
ZA7305091B Stop means for a railway impact absorbing device