US2541384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a luminescent zinc sulfide
Assignee: Hartford National Bank and Trust Co
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Filing: 1947-12-06
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Granted: 1951-02-13
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Expires: 1967-12-06
Abstract
No abstract record available.
Inventors
- 👤 Rothschild Siegfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:55
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/61; C09K11/611; C09K11/612
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR THE PRODUCTION OF A LUMINESCENT ZINC SULPHIDE, COMPRISING THE STEPS OF MIXING ZINC SULPHIDE, A COPPER ACTIVATOR, A HALIDE SELECTED FROM THE GROUP CONSISTING OF THE ALKALI METALS AND ALKALINE-EARTH METALS, AND LESS THAN ABOUT 5% OF ONE OF THE ELEMENTS CONSTITUTING PURE ZINC SULPHIDE, AND HEATING THE SO FORMED MIXTURE TO THE REACTION TEMPERATURE THEREOF IN AN INERT ATMOSPHERE.
Claim 2
Dependent Claim
63 words
A PROCESS FOR THE PRODUCTION OF A LUMINESCENT ZINC SULPHIDE, COMPRISING THE STEPS OF MIXING ZINC SULPHIDE, A COPPER ACTIVATOR, A HALIDE SELECTED FROM THE GROUP CONSISTING OF THE ALKALI METALS AND ALKALINE-EARTH METALS, AND LESS THAN ABOUT 5% OF ONE OF THE ELEMENTS CONSTITUTING PURE ZINC SULPHIDE, AND HEATING THE SO FORMED MIXTURE TO THE REACTION TEMPERATURE THEREOF IN AN INERT ATMOSPHERE.
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) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |