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:
Apr. 27, 1993
Filed:
Feb. 03, 1992
Raymond L Brown, Fountain Valley, CA (US);
Gerald B Smith, Huntington Beach, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
Discrete solder preforms (28, 14a, 14b, 14c) are quickly and accurately placed on substrates (10) to be soldered by means of a foil sheet (24) apertured (26) with the pattern of preform placement. The foil sheet has a vacuum drawn through its apertures, and a number of discrete solder preforms are randomly projected from a vibratory membrane (38) up against the foil to be attached to the foil at each of its apertures. Then the foil sheet with its vacuum attached solder preforms (28, 14a, 14b, 14c) is moved into registration with the flux pattern (12a, 12b, 12c) pre-printed on the substrate (10), and all of the vacuum attached preforms are simultaneously positioned down upon the flux areas of the substrate where they remain when the vacuum is released. Planarity of the thin foil is maintained by a flat somewhat rigid but porous backing member (32) secured to the foil.