US2428014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentric core flux valve
Assignee: Sperry Gyroscope Co Inc
•
Filing: 1943-02-03
•
Granted: 1947-09-30
•
Expires: 1963-02-03
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert S Curry
- 👤 Caesar F Fragola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:34
CPC Classifications
G; G01; G01C; G01C17/00; G01C17/02; G01C17/28; G01C17/30; G01R; G01R33/00; G01R33/02; G01R33/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1334258A
Cited
US1661740A
Cited
US1891044A
Cited
US1992100A
Cited
GB451850A
Cited
US2261309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-29 | 1951-03-31 | 1951-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-29 | 1955-03-31 | 1955-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-29 | 1959-03-31 | 1959-09-30 | $7700.00 | Window Closed / Lapsed |