US3024148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of chemically polishing germanium
Assignee: Honeywell Inc
•
Filing: 1957-08-30
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Granted: 1962-03-06
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Expires: 1977-08-30
Abstract
No abstract record available.
Inventors
- 👤 Glenn R Schaer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:13
CPC Classifications
H; H10; H10P; H10P52/00; H10P52/40; H10P52/402; C; C23; C23F; C23F3/00; C23F3/04; C23F3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A METHOD OF CHEMICALLY POLISHING GERMANIUM SURFACES COMPRISING A GERMANIUM WAFER HAVING A PAIR OF MAJOR SURFACES AND HAVING A CRYSTAL ORIENTATION ALONG SAID SURFACES ACCORDING TO THE MILLER INDEX SYSTEM OF 1, 1, 1, SAID METHOD CONSISTING OF ETCHING SAID WAFER IN A SOLUTIOIN CONSISTING ESSENTIALLY OF FROM 20 TO 100 PARTS BY VOLUME OF HNO3 (70%), FROM 20 TO 100 PARTS BY VOLUME OF HF (50%), AND FROM 30 TO 100 PARTS BY VOLUME OF HOAC (100%), SAID SOLUTION BEING SUBSTANTIALLY SATURATED WITH AIPO4.
Claim 2
Independent Claim
86 words
A METHOD OF CHEMICALLY POLISHING GERMANIUM SURFACES COMPRISING A GERMANIUM WAFER HAVING A PAIR OF MAJOR SURFACES AND HAVING A CRYSTAL ORIENTATION ALONG SAID SURFACES ACCORDING TO THE MILLER INDEX SYSTEM OF 1, 1, 1, SAID METHOD CONSISTING OF ETCHING SAID WAFER IN A SOLUTIOIN CONSISTING ESSENTIALLY OF FROM 20 TO 100 PARTS BY VOLUME OF HNO3 (70%), FROM 20 TO 100 PARTS BY VOLUME OF HF (50%), AND FROM 30 TO 100 PARTS BY VOLUME OF HOAC (100%), SAID SOLUTION BEING SUBSTANTIALLY SATURATED WITH AIPO4.
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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) | 1965-03-05 | 1965-09-04 | 1966-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-05 | 1969-09-04 | 1970-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-05 | 1973-09-04 | 1974-03-06 | $7700.00 | Window Closed / Lapsed |