US2822250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material removal from semi-conductive metal telluride
Assignee: US Philips Corp
•
Filing: 1955-11-28
•
Granted: 1958-02-04
•
Expires: 1975-11-28
Abstract
No abstract record available.
Inventors
- 👤 Nobel Dirk De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:51
CPC Classifications
C; C23; C23F; C23F4/00; H; H10; H10P; H10P95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD OF REMOCING BY ETCHING A SURFACE PORTION OF A SEMI-CONDUCTIVE BODY CONSTITUTED BY A TELLURIDE OF A BIVALENT METAL, COMPRISING CONVERTING THE MATERIAL OF SAID SURFACE PORTION OF SAID BODY TO A MATRIAL SELECTED FROM THE GROUP CONSISTING OF TELLURIUM, TELLURIUM OXIDE, AND MIXTURES THEREOF, AND TREATING SAID THUS-FORMED SURFACE PORTION WITH A SOLUTION OF NA2S2O4 AND NAOH TO REMOVE SAME.
Claim 2
Independent Claim
63 words
A METHOD OF REMOCING BY ETCHING A SURFACE PORTION OF A SEMI-CONDUCTIVE BODY CONSTITUTED BY A TELLURIDE OF A BIVALENT METAL, COMPRISING CONVERTING THE MATERIAL OF SAID SURFACE PORTION OF SAID BODY TO A MATRIAL SELECTED FROM THE GROUP CONSISTING OF TELLURIUM, TELLURIUM OXIDE, AND MIXTURES THEREOF, AND TREATING SAID THUS-FORMED SURFACE PORTION WITH A SOLUTION OF NA2S2O4 AND NAOH TO REMOVE SAME.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |