US2794073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: BELL TELEPHONE LAOBORATORIES I
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Filing: 1952-09-10
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Granted: 1957-05-28
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Expires: 1972-09-10
Abstract
No abstract record available.
Inventors
- 👤 Gustav E Hoppe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:41
CPC Classifications
H; H01; H01H; H01H67/00; H01H67/22; H01H67/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1972289A
Cited
US2267936A
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US2479678A
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US2577468A
Cited
US2519849A
Cited
US2576785A
Cited
US2604542A
Cited
US2741699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-27 | 1960-11-26 | 1961-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-27 | 1964-11-26 | 1965-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-27 | 1968-11-26 | 1969-05-28 | $7700.00 | Window Closed / Lapsed |