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:
Jan. 17, 1995
Filed:
Sep. 21, 1992
Applicant:
Inventor:
Roland H Thoms, Cortland, NY (US);
Assignee:
BMC Industries, Inc., Bloomington, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313402 ; 313403 ;
Abstract
A shadow mask for use in forming a television tube having a plurality of openings therein with the mask grade side having an average centerline roughness R.sub.ag, which is less than cone side average centerline roughness R.sub.ac so that when a plurality of aperture masks are stacked with the grade side of one mask in contact with the cone side of an adjacent mask, the greater roughness of the cone side provides sufficient spacing between the shadow masks to allow gasses to enter between the stacked masks to permit batch annealing of the stack of masks without having the stacked masks adhere to one another during the annealing process.