US2623956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone test selector
Assignee: Stromberg Carlson Corp
•
Filing: 1949-02-14
•
Granted: 1952-12-30
•
Expires: 1969-02-14
Abstract
No abstract record available.
Inventors
- 👤 Kessler Frank
- 👤 Winfred T Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:07
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/20; H04Q1/22; H04Q1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1253228A
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US1576723A
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US1531046A
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US1716471A
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US1881544A
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US2389076A
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US2550820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |