US3440488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for producing illumination of progressive portions of a gas-filled luminescent tube
Assignee: Microdot Inc
•
Filing: 1965-06-24
•
Granted: 1969-04-22
•
Expires: 1985-06-24
Abstract
No abstract record available.
Inventors
- 👤 Clifford D Skirvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:00
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/44; Y; Y10; Y10S; Y10S315/00; Y10S315/02; Y10S315/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2696584A
Cited
US2598241A
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US2736842A
Cited
US3016478A
Cited
US3265907A
Cited
US3299320A
Cited
US3308342A
Cited
US3344311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |