US2561426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone switchboard with expansible bays and cable racks
Assignee: STC PLC
•
Filing: 1947-10-11
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Granted: 1951-07-24
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Expires: 1967-10-11
Abstract
No abstract record available.
Inventors
- 👤 Franklin A Stearn
- 👤 Lionel P Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:28
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/02; H04Q1/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US385846A
Cited
US472947A
Cited
US1039773A
Cited
US1519499A
Cited
US1795930A
Cited
US1999497A
Cited
US2459237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |