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:
Nov. 18, 1997
Filed:
Jan. 17, 1996
Applicant:
Inventors:
Phong Xuan Nguyen, Encino, CA (US);
Steven Russell Nissen, Culver City, CA (US);
Assignee:
Ohmega Electronics, Inc., Culver City, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
H01C / ; H01C / ; H01C / ; B32B / ;
U.S. Cl.
CPC ...
338308 ; 338309 ; 338314 ; 338327 ; 338328 ; 252513 ; 252518 ; 428667 ; 428209 ; 428901 ;
Abstract
A circuit board material is disclosed which includes a support layer, at least one electrical resistance layer having a preselected resistivity adhered to the support layer, a barrier layer adhered to the electrical resistance layer, and a conductive layer adhered to the barrier layer. The barrier layer is capable of protecting the resistance layer from attack by alkaline ammoniacal copper etchants. A method of producing the circuit board material is also disclosed.