Low friction macromolecular materials for coating disk and head surfaces
CA 2016341 C · Owner: Digital Equipment Corporation · Inventors: Schmidt, Paul Herman
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A low-friction corrosion-resistant substrate, includes a substrate and a macromolecular Langmuir- Blodgett film in coating relationship with the substrate, the film having a multiplicity of macromolecules, each including a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of substantially each macromolecule is bonded to a surface of the substrate and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air. The film may also include planar heterocyclic molecules. A low-friction corrosion-resistant read/write head and/or recording medium includes a Langmuir-Blodgett film in coating relationship with the surface thereof.
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
- Filed May 9, 1990 and granted March 29, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 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.