US2431022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone transmitter
Assignee: Kellogg Switchboard and Supply Co
•
Filing: 1944-01-31
•
Granted: 1947-11-18
•
Expires: 1964-01-31
Abstract
No abstract record available.
Inventors
- 👤 George H Brodie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:43
CPC Classifications
H; H04; H04R; H04R21/00; H04R21/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US837457A
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US1117231A
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US1517063A
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US1588627A
Cited
US1777924A
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US1964606A
Cited
US2014427A
Cited
US2042822A
Cited
US2086107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-17 | 1951-05-19 | 1951-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-17 | 1955-05-19 | 1955-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-17 | 1959-05-19 | 1959-11-18 | $7700.00 | Window Closed / Lapsed |