Patent US1911138A successfully refreshed from Google Patents.
US2493534A
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Testing device for seismic signal apparatus
Assignee: Seismograph Service Corp
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Filing: 1947-06-13
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Granted: 1950-01-03
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Expires: 1967-06-13
Abstract
No abstract record available.
Inventors
- 👤 James E Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:18
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/88; G; G01; G01V; G01V1/00; G01V1/24; G01V1/245; G05; G05B; G05B19/00; G05B19/02; G05B19/04; G05B19/12; G05B19/124; G06; G06E; G06E3/00; G06E3/001; G06K; G06K11/00; G05B2219/00; G05B2219/20; G05B2219/23; G05B2219/23201
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) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |