Patent US2247890A successfully refreshed from Google Patents.
US2493543A
Expired / Lapsed
US
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Monitoring system of comparator type
Assignee: Brush Development Co
•
Filing: 1947-09-08
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Granted: 1950-01-03
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Expires: 1967-09-08
Abstract
No abstract record available.
Inventors
- 👤 Charles J Merchant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:09
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/18; G08B13/189; G08B13/194; G01; G01S; G01S1/00; G01S1/02; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/538
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2410424A
Cited
US2411494A
Cited
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 |