US2428479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp construction
Assignee: EA Laboratories Inc
•
Filing: 1944-09-22
•
Granted: 1947-10-07
•
Expires: 1964-09-22
Abstract
No abstract record available.
Inventors
- 👤 Constantine E Tsouros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:56
CPC Classifications
F; F21; F21V; F21V13/00; F21S; F21S41/00; F21S41/20; F21S41/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1313716A
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US1681042A
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US1884076A
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US2138077A
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US2253628A
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US2271425A
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US2363147A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-06 | 1951-04-07 | 1951-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-06 | 1955-04-07 | 1955-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-06 | 1959-04-07 | 1959-10-07 | $7700.00 | Window Closed / Lapsed |