Sealing material made of expanded graphite and a method of producing the same
CA 2230182 C · Owner: Nippon Pillar Packing Co. Ltd. · Inventors: Sugita, Katsunori; Horii, Daisaburo; Ueda, Takahisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
32-, The invention relates to a sealing material made of expanded graphite and a method of producing it. In the sealing material made of expanded graphite of the invention a surface layer portion of an expanded graphite base material 11 in which expanded graphite particles 1 are pressurized is subjected to a blast process or the like whereby the weight, of the expanded graphite base material 11 is reduced by a range of 0.5 to 3%, so that the diffraction peak of an X-ray diffraction of the exposed surface layer portion of the expanded graphite base material 11 is in a range of 26.52 to 26.48. In such an sealing material made of expanded graphite the elongation rate and the tensile strength …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 26, 1997 and granted September 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 2019.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.