Patent US3361979A successfully refreshed from Google Patents.
US3361979A
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US
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Apparatus for the detection of the slope of an electric signal
Assignee: Shell USA Inc
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Filing: 1964-03-17
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Granted: 1968-01-02
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Expires: 1984-03-17
Abstract
No abstract record available.
Inventors
- 👤 Luttik Co
- 👤 Schuringa Albertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:32
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/44; G01J1/46; G01J3/00; G01J3/28; G01N; G01N30/00; G01N30/02; G01N30/86; G01N30/8624; G01R; G01R19/00; G01R19/12; G06; G06G; G06G7/00; G06G7/12; G06G7/18; G06G7/184; H; H03; H03K; H03K9/00; G01N30/8603; G01N30/8606
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) | 1971-01-01 | 1971-07-03 | 1972-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-01 | 1975-07-03 | 1976-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-01 | 1979-07-03 | 1980-01-02 | $7700.00 | Window Closed / Lapsed |