Patent US2722490A successfully refreshed from Google Patents.
US2722490A
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Germanium elements and methods of preparing same
Assignee: AT&T Inc
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Filing: 1950-07-24
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Granted: 1955-11-01
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Expires: 1970-07-24
Abstract
No abstract record available.
Inventors
- 👤 James R Haynes
- 👤 Robert D Heidenreich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:41
CPC Classifications
H; H10; H10P; H10P95/00; H10W; H10W74/00; H10W74/40; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12674; Y10T428/12681; Y10T428/12708
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
53 words
THE METHOD OF TREATING THE SURFACE OF A GERMANIUM BODY TO REDUCE THE RATE OF ELECTRON HOLE COMBINATION WHICH COMPRISES COATING THE SURFACE WITH AN ADHERENT LAYER CONSISTING ESSENTIALLY OF COLLOIDAL PARTICLES OF AT LEAST ONE OF THE OXYHALIDES OF THE METALS SELECTED FROM THE GROUP CONSISTING OF ANTIMONY, BISMUTH, AND STANNOUS TIN.
References Cited (Backward Citations)
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US2198329A
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US2327462A
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US2393068A
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US2310128A
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US2364436A
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US2426445A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-31 | 1959-05-02 | 1959-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-31 | 1963-05-02 | 1963-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-31 | 1967-05-02 | 1967-11-01 | $7700.00 | Window Closed / Lapsed |