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GREFCO

Overview
  • Total Patents
    177
About

GREFCO has a total of 177 patent applications. Its first patent ever was published in 1964. It filed its patents most often in United States, Germany and France. Its main competitors in its focus markets materials and metallurgy, civil engineering and environmental technology are NAT GYPSUM PROPERTIES LLC, BPB INDUSTRIES LTD and MILLER DOUGLAS J.

Patent filings in countries

World map showing GREFCOs patent filings in countries

Patent filings per year

Chart showing GREFCOs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Ruff David L 21
#2 Tarbell Harlan E 14
#3 Mogg Donald W 12
#4 Stewart Sherman A 8
#5 Oshida Otto A 8
#6 Collins Albert R 7
#7 Neu Ernest L 6
#8 Nath N Gokul 6
#9 Siddiqui Nadeem U 5
#10 Snyder Estel R 5

Latest patents

Publication Filing date Title
US5002696A Expanded mineral particles and apparatus and method of production
US4671973A Method for the treatment of mineral extender fillers
US4521182A Method and apparatus for heating particulate material
GB2084624A Insulation board
US4313997A Perlite boards and method for making same
US4302344A Loose-fill, thermal insulation
US4255489A Perlite filler
US4187174A Diatomaceous earth filteraid and method for its manufacture
JPS5567448A Compound board that is light and has excellent heat insulating property
IE46450B1 Strip for fastening and sealing sheets of construction material
GB1570058A Strip for fastening and sealing sheets of construction material
US4145284A Method for making polymeric filter aids and products thereof
US4183980A Perlite filler coated with polydimethylsiloxane
US4212755A Settle resistant loose-fill perlite insulation comprising particles rendered slightly tacky by a coating thereon
US4142968A Diatomaceous earth filteraid and method for its manufacture
IT1206375B Frangible particles comminuted by impact - against square section bars arranged transversely of high speed air stream carrying particles
US4110501A Splicing strip
US4059933A Strip for fastening and sealing sheets of construction material
US4011183A Building board products and process for producing same
US4059231A Method and apparatus for selectively comminuting particles of a frangible material