Patent US3781558A successfully refreshed from Google Patents.
US1933306A
Expired / Lapsed
US
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Electrical frequency analyzer
Assignee: General Electric Co
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Filing: 1931-04-30
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Granted: 1933-10-31
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Expires: 1951-04-30
Abstract
No abstract record available.
Inventors
- 👤 Theodore M Berry
- 👤 Jr Milton S Mead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:43
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/48; G; G01; G01R; G01R23/00
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) | 1936-10-30 | 1937-05-01 | 1937-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-10-30 | 1941-05-01 | 1941-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-10-30 | 1945-05-01 | 1945-10-31 | $7700.00 | Window Closed / Lapsed |