US2684409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote testing apparatus for telephone dials
Assignee: Stromberg Carlson Corp
•
Filing: 1950-08-15
•
Granted: 1954-07-20
•
Expires: 1970-08-15
Abstract
No abstract record available.
Inventors
- 👤 Kessler Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:00
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1677157A
Cited
US2244338A
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US2369619A
Cited
US2360989A
Cited
US2400287A
Cited
US2486172A
Cited
US2489282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-19 | 1958-01-18 | 1958-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-19 | 1962-01-18 | 1962-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-19 | 1966-01-18 | 1966-07-20 | $7700.00 | Window Closed / Lapsed |