Patent US1620530A successfully refreshed from Google Patents.
US2155449A
Expired / Lapsed
US
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Self-luminous article
Assignee: Individual
•
Filing: 1938-10-24
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Granted: 1939-04-25
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Expires: 1958-10-24
Abstract
No abstract record available.
Inventors
- 👤 Ellsworth F Seaman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:55
CPC Classifications
G; G09; G09F; G09F13/00; G09F13/16; F; F21; F21V; F21V13/00; F21V13/02; F21V13/08; F21V9/00; F21V9/30; F21V9/32; G09F13/04; G09F13/14; H; H01; H01J; H01J65/00; H01J65/08
Claims Analysis
Total Claims: 0
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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) | 1942-04-24 | 1942-10-24 | 1943-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-04-24 | 1946-10-24 | 1947-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-04-24 | 1950-10-24 | 1951-04-25 | $7700.00 | Window Closed / Lapsed |