US2447168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency electric conductors and cables
Assignee: Telegraph Construction and Maintenance Co Ltd
•
Filing: 1943-09-16
•
Granted: 1948-08-17
•
Expires: 1963-09-16
Abstract
No abstract record available.
Inventors
- 👤 Dean John Norman
- 👤 Smith Esmond Wassell
- 👤 Sear Reginald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:20
CPC Classifications
H; H01; H01B; H01B11/00; H01B11/02; H01B11/06; H01B11/10; H01B11/1025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR650556A
Cited
FR686552A
Cited
US2322702A
Cited
US1948616A
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US1861182A
Cited
GB385146A
Cited
US2019297A
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FR762534A
Cited
US2250032A
Cited
GB559518A
Cited
US2344501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-17 | 1952-02-16 | 1952-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-17 | 1956-02-16 | 1956-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-17 | 1960-02-16 | 1960-08-17 | $7700.00 | Window Closed / Lapsed |