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Patent US2421975A successfully refreshed from Google Patents.
US2421975A
Expired / Lapsed
US
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Manufacture of fluorescent tubing
Assignee: Individual
•
Filing: 1943-03-19
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Granted: 1947-06-10
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Expires: 1963-03-19
Abstract
No abstract record available.
Inventors
- 👤 Roscoe D Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:04
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/221
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1657784A
Cited
US2022587A
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US2151686A
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US2135732A
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US2196058A
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US2179288A
Cited
US2238784A
Cited
US2318060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-09 | 1950-12-09 | 1951-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-09 | 1954-12-09 | 1955-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-09 | 1958-12-09 | 1959-06-10 | $7700.00 | Window Closed / Lapsed |