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US2541936A
Expired / Lapsed
US
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Register-sender for automatic telephone systems
Assignee: Stromberg Carlson Corp
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Filing: 1947-07-10
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Granted: 1951-02-13
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Expires: 1967-07-10
Abstract
No abstract record available.
Inventors
- 👤 Winfred T Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:30
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1732185A
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US1831399A
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US1849694A
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US1832447A
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US2106360A
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US2149646A
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US2283395A
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US2325877A
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US2381516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |