US2617773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead activated calcium tungstate phosphor
Assignee: Westinghouse Electric Corp
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Filing: 1948-09-10
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Granted: 1952-11-11
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Expires: 1968-09-10
Abstract
No abstract record available.
Inventors
- 👤 Nagy Rudolph
- 👤 Wollentin Robert William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:37
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/67; C09K11/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A PHOSPHOR FOR FLUORESCENT LAMPS CONSISTING OF THE FIRED REACTION PRODUCT OF THE FOLLOWING CONSTITUENTS IN ABOUT THE STATED PROPORTIONS: 1 MOLE CALCIUM CARBONATE; 1 MOLE TUNGSTIC ACID; 1/10 MOLE OF A MAGNESIUM COMPOUND SELECTED FROM THE OXIDE AND THOSE DECOMPOSING TO THE OXIDE
Claim 2
Dependent Claim
44 words
A PHOSPHOR FOR FLUORESCENT LAMPS CONSISTING OF THE FIRED REACTION PRODUCT OF THE FOLLOWING CONSTITUENTS IN ABOUT THE STATED PROPORTIONS: 1 MOLE CALCIUM CARBONATE; 1 MOLE TUNGSTIC ACID; 1/10 MOLE OF A MAGNESIUM COMPOUND SELECTED FROM THE OXIDE AND THOSE DECOMPOSING TO THE OXIDE
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) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |