The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 28, 1993
Filed:
Apr. 30, 1992
Applicant:
Inventors:
Thomas E Lewis, E. Hampstead, NH (US);
Richard A Williams, Hampstead, NH (US);
John P Gardiner, Londonderry, NH (US);
John F Kline, Londonderry, NH (US);
Assignee:
Presstek, Inc., Hudson, NH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41C / ; B41C / ;
U.S. Cl.
CPC ...
101467 ; 346159 ;
Abstract
A method of and apparatus for imaging a lithographic plate having a printing surface by exposing the printing surface to plasma jet discharges between the plate and a plasma jet nozzle spaced close to the printing surface of the plate. These plasma jet discharges are sufficient to ablate or otherwise transform one or more layers of the printing surface, thereby changing the affinity of the printing surface for ink and/or water at the points thereof exposed to the discharges so as to produce image spots on the plate.