Patent US3133888A successfully refreshed from Google Patents.
US3133888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of semiconductor materials
Assignee: Hitachi Ltd
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Filing: 1961-05-04
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Granted: 1964-05-19
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Expires: 1981-05-04
Abstract
No abstract record available.
Inventors
- 👤 Oikawa Mitsuru
- 👤 Okabe Tadao
- 👤 Maruyama Euchi
- 👤 Sugawara Masao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:21
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H10; H10P; H10P95/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
A METHOD OF PRODUCING PHOTOSENSITIVE MATERIALS CONTAINING AN ACTIVATING IMPURITY COMPRISING ADMIXING A QUANTITY AS A FLUX CADMIUM CHLORIDE AND A CHLORIDE SELECED FROM THE GROUP CONSISTING OF MAGNESIUM CHLORIDE CALCIUM CHLORIDE, SODIUM CHLORIDE AND POTASSIUM CHLORIDE TO CADMIUM SULFIDE CONTAINING A QUANTITY OF A METAL SELECTED FROM THE GROUP CONSISTING OF COPPER AND SILVER; EACH OF THE TWO CHLORIDES BEING IN A MOL RATIO OF BETWEEN 3:2-2:3 AND IN A QUANTITY OF 0.1 TO 0.5 IN HALIDE CONTENT WITH RESPECT TO ONE MOL OF THE CADMIUM SULFIDE; THEN CALCINING THE MIXTURE AT A TEMPERATURE OF BETWEEN 400-600* C., THEREAFTER REMOVING THE FLUX BY SOLVENT EXTRACTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-19 | 1967-11-18 | 1968-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-19 | 1971-11-18 | 1972-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-19 | 1975-11-18 | 1976-05-19 | $7700.00 | Window Closed / Lapsed |