Photolithographic receptor base
CA 1060695 A · Owner: Minnesota Mining And Manufacturing Company · Inventors: Pierson, Dallas K.; Boston, David R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A photolithographic receptor base for silver salt diffusion transfer imaging comprising a substrate with a layer of hydrophilic colloidal silica containing silver precipitating nuclei thereon the, silica layer being formed from a mixture of two colloidal silica solutions of substantially uniform particle size one having a particle size of about 2.5 times that of the other. The photolithographic base of the present invention has a longer useful life than those Known in the prior art. This is believed to be the result of forming the base from two colloidal silicas rather than the single colloidal silica of the prior art.
Read the whole patent
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 August 21, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 21, 1996.
- 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.