US2448575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical instrument follow-up system
Assignee: Brown Instruments Co
•
Filing: 1942-06-18
•
Granted: 1948-09-07
•
Expires: 1962-06-18
Abstract
No abstract record available.
Inventors
- 👤 Edwin C Burdick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:25
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US649644A
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US1914481A
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US1774673A
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US2047727A
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US2255601A
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US2292937A
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US2214609A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-07 | 1952-03-08 | 1952-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-07 | 1956-03-08 | 1956-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-07 | 1960-03-08 | 1960-09-07 | $7700.00 | Window Closed / Lapsed |