US2997583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for heterodyne mixing
Assignee: General Electric Co
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Filing: 1958-03-17
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Granted: 1961-08-22
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Expires: 1978-03-17
Abstract
No abstract record available.
Inventors
- 👤 Ziel Aldert Van Der
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:57
CPC Classifications
H; H03; H03D; H03D7/00; H03D7/06; H03D7/08; H01; H01J; H01J19/00; H01J19/42; H01J21/00; H01J21/36; H01J2893/00; H01J2893/0001; H01J2893/0002
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) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |