Method and means for controlling overburn in spark-imaged lithography plates
CA 2042033 A1 · Owner: Presstek, Inc. · Inventors: Lewis, Thomas E.; Nowak, Michael T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
57) Abstract, A method of and means for controlling unwanted degradation of overlapping image points in a spark-imaged lithographic plate is set forth. A suitable conductive sheet having an appropriately selected volume resistivity is placed beneath the conductive metal sheet of the plate, thereby drawing off excess spark energy during the imaging process.
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 September 21, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 21, 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.