5 Utility Patents
#1,515 in Pittsburgh, PA
#14,902 in Pennsylvania
#397,698 in US
#826,892 in the World
Forward Citations = 31
Company Filing History:
Dresser Industries, Inc.
Harbison-walker Refractories Company
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#1,515 in Pittsburgh, PA
#14,902 in Pennsylvania
#397,698 in US
#826,892 in the World
Company Filing History:
Get your Inventor Badge Today