Adhesives and method for making same
CA 2055467 A1 · Owner: Martin Marietta Energy Systems, Inc. · Inventors: Dorsey, George F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A thermosetting mixture for use as an adhesive as well as other , applications, that is substantially nonmutagenic. This mixture is based upon a thermosetting resin selected from polyurethane and epoxy resins, using an improved curing agent that does not contain mutagenic components. Specifically the curing agent is a, multi-mixture of substituted alkylanilines produced by an improved process. These alkylanilines are formed by condensation of at least two alkylanilines with a formaldehyde in an acid solution. Upon purification, at least three aromatic diamines are formed that are used for the curing agent with the polyurethane and epoxy resins. Pot life, green strength and ultimate …
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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 27, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.