US2005257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum tube grid
Assignee: Heintz & Kaufman Ltd
•
Filing: 1933-04-26
•
Granted: 1935-06-18
•
Expires: 1953-04-26
Abstract
No abstract record available.
Inventors
- 👤 William W Eitel
- 👤 Mccullough Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:05
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/38; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0015
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) | 1938-06-17 | 1938-12-17 | 1939-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-06-17 | 1942-12-17 | 1943-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-06-17 | 1946-12-17 | 1947-06-18 | $7700.00 | Window Closed / Lapsed |