Method for making multilayer devices using only a single critical masking step
CA 1071761 A · Owner: International Business Machines Corporation · Inventors: Hatzakis, Michael; Powers, John V.; Ahn, Kie Y.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for making multilayer devices such as, magnetic bubble domain devices which are comprised of a, plurality of layers that are deposited using only a single critical masking step. A first metallic layer is deposited on a substrate including a magnetic bubble domain film which may or may not have a nonmagnetic material thereon. A first resist layer is then applied selectively exposed, and developed to expose at least two areas of the first metallic film. A thicker metallic layer is then deposited in the exposed areas, or is electroplated. After this another resist layer is applied without deforming the pattern in the first layer, selectively exposed and developed to, protect certain …
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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 February 12, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 12, 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.
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.