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US3769112A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for making a mold for casting open tunnels in plated wire mats

Assignee: Boeing North American Inc
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Filing: 1971-03-17
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Granted: 1973-10-30
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Expires: 1991-03-17
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Abstract

Abstract A series of processes are described for making mats to accommodate plated wire memory conductors. Certain of these mats also include interstitial conductors. Outer layers of metal are etched to form word-straps. These word-straps are orthogonal to the tunnels in the mats, which tunnels accommodate the plated wires. Interstitial conductors used, are generally connected to a common point. In order to provide ready access to these tunnels or channels for easy insertion of the plated wires therein, molds are made by either of two special processes, which molds have cavities therein for retaining resin to be molded into walls forming the aforesaid tunnels. The molds provided results in both instances when used in a molding machine and/or in a press, in the final product, wherein the tunnels are blocked off at either end by the plastic material which is also used to form the top and bottom of tunnels. This is done in order to prevent accumulations within the tunnels of undesired matter and thereby prevent blocking of the tunnels and prevent inhibiting the insertion of the plated wires. Therefore, by cutting off an end strip of the plastic material covering the tunnel entrances at both ends after completing of molding or forming operations, the tunnels thus provided are free and clear of undesired foreign matter.

Inventors

  • 👤 W Bennett
  • 👤 J Shaheen
  • 👤 L Quintana

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 09:36
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02; Y; Y10; Y10T; Y10T29/00; Y10T29/50; Y10T29/505; Y10T29/51

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 27 words
The invention as stated in claim 1, wherein: the depth of etching the exposed portions of the first of said major surfaces being at least 0.002 inches.
Claim 2
Dependent Claim 24 words
The invention as stated in claim 1, wherein: the etched depressions in the exposed portions of the first of said major surfaces are arc-shaped.
Claim 3
Dependent Claim 13 words
The invention as stated in claim 1, wherein: said metallic plate is brass.
Claim 4
Dependent Claim 25 words
The invention as stated in claim 1, wherein: the step of plating is accomplished by applying solder on the exposed surface of said metallic plate.
Claim 5
Dependent Claim 18 words
The invention as stated in claim 1, wherein: methylethylketone compound is used for stripping the first photoresist material.
Claim 6
Dependent Claim 23 words
The invention as stated in claim 1, wherein: the step of etching is accomplished by applying chromic sulfuric acid to said metallic plate.
Claim 7
Dependent Claim 44 words
The invention as stated in claim 1, wherein: the step of removing the remaining portion of said second photoresist material is accomplished by the use of methylethylketone and the plated material is removed by the use of a fluoroboric acid and hydrogen peroxide mixture.
Claim 8
Dependent Claim 22 words
The invention as stated in claim 1, wherein: the step of flash etching is accomplished by the use of chromic sulfuric acid.

References Cited (Backward Citations)

US3567533A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-10-29 1977-04-30 1977-10-30 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-10-29 1981-04-30 1981-10-30 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-10-29 1985-04-30 1985-10-30 $7700.00 Window Closed / Lapsed

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