US2935781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of germanium translators
Assignee: AT&T Inc
•
Filing: 1955-12-01
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Granted: 1960-05-10
•
Expires: 1975-12-01
Abstract
No abstract record available.
Inventors
- 👤 Robert D Heidenreich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:19
CPC Classifications
H; H10; H10P; H10P95/00; H10P14/00; H10P14/60; H10P14/63; H10P14/6302; H10P14/6304; H10P14/6306; H10P14/6308
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
THE METHOD OF PREPARING A GERMANIUM BODY WHICH COMPRISES IMMERSING SAID BODY IN AN AQUEOUS SOLUTION OF HYDROGEN FLUORIDE AND HYDROGEN PEROXIDE, IN WHICH SOLUTION THE RATIO OF HYDROGEN FLUORIDE TO HYDROGEN PEROXIDE LIES BETWEEN THE VALUES 4:1 AND 20:1, AND IN WHICH SOLUTION THE CONCENTRATION OF HYDROGEN FLUORIDE IS BETWEEN ABOUT 50 GRAMS PER LITER OF SOLUTION AND 325 GRAMS PER LITER OF SOLUTION, TILL SUCH IMMERSION PRODUCES AN OXIDE FILM ON THE SURFACE OF SAID GERMANIUM BODY.
Claim 2
Independent Claim
79 words
THE METHOD OF PREPARING A GERMANIUM BODY WHICH COMPRISES IMMERSING SAID BODY IN AN AQUEOUS SOLUTION OF HYDROGEN FLUORIDE AND HYDROGEN PEROXIDE, IN WHICH SOLUTION THE RATIO OF HYDROGEN FLUORIDE TO HYDROGEN PEROXIDE LIES BETWEEN THE VALUES 4:1 AND 20:1, AND IN WHICH SOLUTION THE CONCENTRATION OF HYDROGEN FLUORIDE IS BETWEEN ABOUT 50 GRAMS PER LITER OF SOLUTION AND 325 GRAMS PER LITER OF SOLUTION, TILL SUCH IMMERSION PRODUCES AN OXIDE FILM ON THE SURFACE OF SAID GERMANIUM BODY.
References Cited (Backward Citations)
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Cited
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Cited
US2650311A
Cited
US2695852A
Cited
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Cited
US2812480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-10 | 1963-11-09 | 1964-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-10 | 1967-11-09 | 1968-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-10 | 1971-11-09 | 1972-05-10 | $7700.00 | Window Closed / Lapsed |