Electricity: conductors and insulators – Conduits – cables or conductors – Single duct conduits
Patent
1983-07-14
1985-09-03
Grimley, A. T.
Electricity: conductors and insulators
Conduits, cables or conductors
Single duct conduits
204192SP, 427 96, H05K 109, H05K 116, H05K 310
Patent
active
045394342
ABSTRACT:
An electrical substrate circuit device (10) includes a thick film crossunder conductor (14) and a thin film crossover conductor (16). An intermediate portion of the thick film conductor (14) is covered with a coating (28) of electrically insulating glaze material and opposite end portions (18) of the thick film conductor are electrically connected to thin film contact pads (20) by electrically conductive contact portions (22) in an electrically insulating protective tantalum pentoxide film layer (24). The electrically conductive contact portions (22) are produced by gold material in the end portions (18) of the thick film conductor (14) diffusing into overlying portions of a tantalum film (30) as the tantalum film is converted to the protective tantalum pentoxide film layer (24) by thermal oxidation.
REFERENCES:
patent: 3717563 (1973-02-01), Revitz et al.
patent: 3900944 (1975-08-01), Fuller et al.
patent: 4251326 (1981-02-01), Arcidiacono et al.
patent: 4290188 (1981-09-01), Ichinosi et al.
patent: 4300149 (1981-11-01), Howard et al.
AT&T - Technologies, Inc.
Grimley A. T.
Nimmo Morris H.
Rosen S. I.
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