Patent US1919780A successfully refreshed from Google Patents.
Patent US2879582A successfully refreshed from Google Patents.
US2879582A
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Method of making copper oxide rectifiers
Assignee: AT&T Inc
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Filing: 1953-12-31
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Granted: 1959-03-31
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Expires: 1973-12-31
Abstract
No abstract record available.
Inventors
- 👤 William C Michal
- 👤 Walter J Tesche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:34
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/07; H10P; H10P14/00; H10P14/20; H10P14/203; H10P14/34; H10P14/3402; H10P14/3434; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981; Y10T29/49812
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
THE METHOD OF MAKING COPPER OXIDE RECTIFIERS THAT COMPRISES REMOVING DISCS OF COPPER FROM A COPPER SHEET SLIGHTLY ENLARGING THE RESULTING ORIFICES IN THE SHEET, REPLACING THE DISCS IN THE ORIFICES FLUSH WITH THE SHEET, OXIDIZING ONE FACE OF THE SHEET AND OF THE DISCS, PRESSING ON THE UNOXIDIZED SIDE OF THE DISCS TO REMOVE THEM FROM THE SHEET WITH A THIN FLANGE OF COPPER OXIDE THERE ON, SELECTIVELY DISSOLVING THE FLANGE, AND APPLYING A COUNTERELECTRODE TO THE COPPER OXIDE SURFACE OF EACH DISC.
Claim 2
Independent Claim
84 words
THE METHOD OF MAKING COPPER OXIDE RECTIFIERS THAT COMPRISES REMOVING DISCS OF COPPER FROM A COPPER SHEET SLIGHTLY ENLARGING THE RESULTING ORIFICES IN THE SHEET, REPLACING THE DISCS IN THE ORIFICES FLUSH WITH THE SHEET, OXIDIZING ONE FACE OF THE SHEET AND OF THE DISCS, PRESSING ON THE UNOXIDIZED SIDE OF THE DISCS TO REMOVE THEM FROM THE SHEET WITH A THIN FLANGE OF COPPER OXIDE THERE ON, SELECTIVELY DISSOLVING THE FLANGE, AND APPLYING A COUNTERELECTRODE TO THE COPPER OXIDE SURFACE OF EACH DISC.
References Cited (Backward Citations)
US2094642A
Cited
US2392744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-30 | 1962-09-29 | 1963-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-30 | 1966-09-29 | 1967-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-30 | 1970-09-29 | 1971-03-31 | $7700.00 | Window Closed / Lapsed |