Patent US3509230A successfully refreshed from Google Patents.
US4023997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of placing an oriented array of devices on a releasable mounting
Assignee: AT&T Inc
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Filing: 1975-07-31
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Granted: 1977-05-17
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Expires: 1995-07-31
Abstract
Abstract An oriented array of small, fragile electrical devices such as beam lead transistors or integrated circuits, partially embedded in wax, are removed from the wax and transferred to a releasable mounting without disrupting the orientation of the devices. The releasable mounting comprises a plate with a layer of silicone rubber or resin which exerts a suction or vacuum holding force on the array of oriented devices.
Inventors
- 👤 William R. Wanesky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:02
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/70; H10P72/74; B; B23; B23Q; B23Q3/00; B23Q3/02; B23Q3/06; B23Q3/08; B23Q3/086; H10W; H10W74/00; H10W74/40; H10P72/741
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
A method of supporting a plurality of articles formed from a sheet of etchable material, which comprises: applying a layer of pressure sensitive, vacuum holding material to a flat support plate that is not dissolvable in an etching solution for said sheet, said pressure sensitive, vacuum holding material selected from the group consisting of silicone rubber and silicone resin; applying a layer of liquid wax to the layer of pressure sensitive, vacuum holding material; placing said sheet of etchable material on said wax to cement the sheet to the layer of pressure sensitive, vacuum holding material; applying resist patterns to conform to the shapes of the articles to be formed from the sheet; applying an etching solution to said exposed areas of said sheet to etch away the sheet between the resist patterns; removing the resist patterns; applying pressure to said support plate and said articles; and immersing said support plate and said articles in a solvent to dissolve the wax while the applied pressure forces the article in holding engagement with the now dewaxed pressure sensitive, vacuum holding layer.
Claim 2
Independent Claim
180 words
A method of supporting a plurality of articles formed from a sheet of etchable material, which comprises: applying a layer of pressure sensitive, vacuum holding material to a flat support plate that is not dissolvable in an etching solution for said sheet, said pressure sensitive, vacuum holding material selected from the group consisting of silicone rubber and silicone resin; applying a layer of liquid wax to the layer of pressure sensitive, vacuum holding material; placing said sheet of etchable material on said wax to cement the sheet to the layer of pressure sensitive, vacuum holding material; applying resist patterns to conform to the shapes of the articles to be formed from the sheet; applying an etching solution to said exposed areas of said sheet to etch away the sheet between the resist patterns; removing the resist patterns; applying pressure to said support plate and said articles; and immersing said support plate and said articles in a solvent to dissolve the wax while the applied pressure forces the article in holding engagement with the now dewaxed pressure sensitive, vacuum holding layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |