US3408523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light bulb with a plurality of independently connected filaments for indicating graphic symbols
Assignee: Ohmega Laboratories
•
Filing: 1966-05-06
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Granted: 1968-10-29
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Expires: 1986-05-06
Abstract
No abstract record available.
Inventors
- 👤 Philip C Demarest
- 👤 Karlson Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:21
CPC Classifications
H; H01; H01K; H01K7/00; H01K7/04; H01K9/00
Claims Analysis
Total Claims: 0
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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) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |