US2743419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency measuring apparatus
Assignee: AT&T Inc
•
Filing: 1950-10-04
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Granted: 1956-04-24
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Expires: 1970-10-04
Abstract
No abstract record available.
Inventors
- 👤 Earl L Chatterton
- 👤 Jr Andrew S Hegeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:20
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/02; G01R23/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2403873A
Cited
US2404047A
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US2403918A
Cited
US2510485A
Cited
US2516189A
Cited
US2497320A
Cited
US2603418A
Cited
US2575087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |