US2810186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing planar grids for vacuum tubes
Assignee: GTE Sylvania Inc
•
Filing: 1952-03-22
•
Granted: 1957-10-22
•
Expires: 1972-03-22
Abstract
No abstract record available.
Inventors
- 👤 Pruszynski Chester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:52
CPC Classifications
H; H01; H01J; H01J19/00; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/0022; H01J2893/0024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
AT124909B
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US1937097A
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US2194551A
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US2314865A
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US2314875A
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US2500355A
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GB600257A
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US2439517A
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US2655589A
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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) | 1960-10-21 | 1961-04-22 | 1961-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-21 | 1965-04-22 | 1965-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-21 | 1969-04-22 | 1969-10-22 | $7700.00 | Window Closed / Lapsed |