Patent US4702552A successfully refreshed from Google Patents.
Patent US3145454A successfully refreshed from Google Patents.
US3145454A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of low impedance diode structures
Assignee: AT&T Inc
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Filing: 1960-07-14
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Granted: 1964-08-25
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Expires: 1980-07-14
Abstract
No abstract record available.
Inventors
- 👤 George C Dacey
- 👤 Jr Robert L Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:47
CPC Classifications
H; H03; H03C; H03C7/00; H03C7/02; H03C7/025; H03C7/027; H03B; H03B7/00; H03B7/12; H03B7/14; H10; H10D; H10D99/00; H10P; H10P95/00; H10W; H10W44/00; H10W44/20; H10W74/00; H10W74/40; H10W74/43; H10W76/00; H10W76/10; H10W76/12; H10W76/13; H10W76/138; H03B2201/00; H03B2201/02; H03B2201/0225; H03B2201/0241
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
THE METHOD OF FABRICATING A LOW IMPEDANCE DIODE ASSEMBLY COMPRISING THE FOLLOWING STEPS: (1) SPREADING A LAYER OF METAL ON THE SURFACE OF A SEMICONDUCTOR WAFER; (2) SUPERIMPOSING ON SAID LAYER A SEPARATOR OF DIELECTRIC MATERIAL; (3) PLACING UPON SAID SEPARATOR A PHOTO-RESISTANT MASK HAVING AN APERTURE THEREIN; (4) ETCHING AWAY THROUGH SAID APERTURE, A MINUTE CHANNEL THROUGH SAID SEPARATOR BY MEANS OF AN ACID THAT IS SELECTIVELY SOLVENT OF SAID DIELECTRIC MATERIAL;
Claim 2
Independent Claim
73 words
THE METHOD OF FABRICATING A LOW IMPEDANCE DIODE ASSEMBLY COMPRISING THE FOLLOWING STEPS: (1) SPREADING A LAYER OF METAL ON THE SURFACE OF A SEMICONDUCTOR WAFER; (2) SUPERIMPOSING ON SAID LAYER A SEPARATOR OF DIELECTRIC MATERIAL; (3) PLACING UPON SAID SEPARATOR A PHOTO-RESISTANT MASK HAVING AN APERTURE THEREIN; (4) ETCHING AWAY THROUGH SAID APERTURE, A MINUTE CHANNEL THROUGH SAID SEPARATOR BY MEANS OF AN ACID THAT IS SELECTIVELY SOLVENT OF SAID DIELECTRIC MATERIAL;
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) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |