US2768488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making electrodeless gaseous discharge letters
Assignee: Individual
•
Filing: 1953-09-02
•
Granted: 1956-10-30
•
Expires: 1973-09-02
Abstract
No abstract record available.
Inventors
- 👤 John M Shelnutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:52
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H01J65/042; H01J9/00; H01J9/38; Y; Y10; Y10S; Y10S53/00; Y10S53/03
Claims Analysis
Total Claims: 0
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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) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |