Method and apparatus for indelibly marking articles during a man

Details Method and apparatus for indelibly marking articles during a man Method and apparatus for indelibly marking articles during a man

1978-12-06

1981-03-17

Larson, Lowell A.

Metal working

Method of mechanical manufacture

Electrical device making

29593, 29740, H05K 330

Patent

active

042558514

ABSTRACT:
An indelible mark (26) is produced on an article of manufacture (17) for indicating a defective article. In the preferred embodiment a bonded lead frame assembly (17) which has a lead frame site (14, 15) with a semiconductor die (18) and cracked ceramic substrate (20) bonded thereto is indelibly marked by causing a spark to occur from an electrode (25) to the bonded lead frame assembly (17) in the vicinity of the lead frame site (14, 15) having a cracked substrate (20).

REFERENCES:
patent: 2316388 (1943-04-01), Annis
patent: 2646609 (1953-07-01), Heins
patent: 3265860 (1966-08-01), Klossika
patent: 3949925 (1976-04-01), Keizer et al.
patent: 3969601 (1976-07-01), Rocklin
patent: 4024522 (1977-05-01), Clark et al.

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