US2542749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone intercept system
Assignee: Stromberg Carlson Corp
•
Filing: 1947-10-22
•
Granted: 1951-02-20
•
Expires: 1967-10-22
Abstract
No abstract record available.
Inventors
- 👤 Harry M Bruckart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:44
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1601052A
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US2208924A
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US2224517A
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US2224497A
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US2258660A
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US2268424A
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US2285282A
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US2300186A
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US2344634A
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US2379456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |