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:
Jun. 16, 1998
Filed:
May. 31, 1996
Kirk Alan Martin, Aptos, CA (US);
Nisene Technology Group, Inc., Santa Cruz, CA (US);
Abstract
An apparatus and method for selectively etching an encapsulant forming a package of resinous material around an electronic device includes a etchant solution source and an etching assembly including an etch plate and a movable cover forming an etching chamber. An etch head is supported by the plate and the device package is mountable in the chamber on the etch head. A first syringe pump pumps a first quantity of etchant into the etch head and a second syringe pump agitates or oscillates at least part of the first quantity of etchant repeatedly into and out of an etched cavity formed on the package exterior surface by reaction of the etchant solution with the resinous material. A waste outlet and reservoir extends from the etch head. The etch head is attached to an alumina ceramic heat exchanger including a spirally grooved passageway formed by an inserted core to heat a small volume of etchant immediately prior to introduction of the etchant against the package and subsequent oscillation.