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:
May. 08, 1984
Filed:
Jun. 30, 1981
Applicant:
Inventors:
Roger A Allen, Gt. Missenden, GB;
Robert J Hall, Flackwell Heath, Nr. High Wycombe, GB;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
219384 ; 83 16 ; 83 70 ; 131281 ; 162261 ;
Abstract
A spark perforation apparatus includes a rotary electrode assembly for effecting spark perforation of sheet material passing between the electrodes of the assembly and a suitably juxtapositioned earthed surface. The electrode assembly comprises a first set of annular electrodes for connection to a suitable power source, a second set of annular electrodes alternating with and of greater external diameter than the electrodes of the first set, and dielectrical material spacing the electrodes so as to form a series of parallel capacitors.