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Expired Canadian patentCanada

Rubberized asphalt paving composition and use thereof

CA 1087805 A · Owner: Union Oil Company Of California · Inventors: Nielsen, Donald L.; Bagley, James R.

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

of Disclosure", The dissolving and/or dispersing of relatively large proportions of reclaimed rubber into molten paving asphalts is facilitated by incorporating into the asphalt a minor porportion of a highly aromatic, high-boiling, high-flash-point mineral oil. The resulting mixtures can be held at temperatures above 300°F for substantial periods of time without becoming too viscous for convenient handling, thereby facilitating the application thereof to roadways. The rubberized asphalt mixtures are particularly useful in the form of stress absorbing membrane interlayers between old, damaged pavement surfaces and an overlayer of new asphalt concrete, for providing chip-seal coatings over …

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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

  • Granted October 21, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 21, 1997.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 26, 1977
GrantedOctober 21, 1980
Term endedOctober 21, 1997
Patent numberCA 1087805 A
Classification (IPC)C08L17/00 +1 more

Timeline

Timeline From CIPO dates

1978198019821984198619881990199219941996Application filedOct 26, 1977Patent grantedOct 21, 1980Term endedOct 21, 1997

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.