US2898452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching systems and apparatus therefor
Assignee: Individual
•
Filing: 1955-10-05
•
Granted: 1959-08-04
•
Expires: 1975-10-05
Abstract
No abstract record available.
Inventors
- 👤 Roland J Berti
- 👤 David C Bettison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:36
CPC Classifications
B; B61; B61L; B61L17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2066702A
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US2011827A
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US2194352A
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US2275436A
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US2254814A
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US2343297A
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US2406031A
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US2570485A
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US2666535A
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US2642974A
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US2700728A
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US2666537A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |