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:
Oct. 17, 1995
Filed:
Feb. 08, 1994
Philip E McKinley, Westford, MA (US);
Carl J Bloch, Wayland, MA (US);
Ramaswamy Ranganathan, Cupertino, CA (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
Cooperative patterns are formed in stencils and/or substrates that facilitate the monitoring and control of the circuit assembly process. A pattern of successively-larger etch blocks receives a corresponding pattern of same-size solder blocks; solder reflow problems are indicated when either too many or too few etch blocks are completely covered by solder after reflow. A pattern of same-size etch blocks receives a corresponding pattern of successively-larger solder blocks; problems with solder stencil clogging are indicated when smaller ones of the etch blocks do not receive solder paste during stenciling. Finally, component beacon openings or translucent areas are made in the electronics assembly at component locations. After component placement, the board is appropriately lit, and any uncovered openings indicate missing or grossly misaligned components.