Structures and processes for fabricating field emission cathodes
CA 2085982 C · Owner: International Business Machines Corporation · Inventors: Zimmerman, Stephen Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates generally to new structures for a field emission cathode and processes for fabricating the same. The field emission is made of any material that is capable of emitting electrons under the influence of an electrical potential. A process for making one embodiment of the invention includes the steps of forming a hole (15) in a substrate (5) depositing, a first material (20) in said hole to form a cusp (21) depositing an electron emitting material (30) to fill at least partly said cusp and removing the first material to expose a portion (31) of the electron emitting material. The field emission cathode has several unique three dimensional structures. The basic …
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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 October 17, 1990 and granted March 9, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 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.