US2427012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sectional telephone stall
Assignee: AT&T Inc
•
Filing: 1943-07-23
•
Granted: 1947-09-09
•
Expires: 1963-07-23
Abstract
No abstract record available.
Inventors
- 👤 George R Lum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:48
CPC Classifications
E; E04; E04H; E04H1/00; E04H1/12; E04H1/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US682621A
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US974852A
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GB167855A
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GB194952A
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US1779482A
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US1698981A
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US1709983A
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US1994857A
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US2213633A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-08 | 1951-03-10 | 1951-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-08 | 1955-03-10 | 1955-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-08 | 1959-03-10 | 1959-09-09 | $7700.00 | Window Closed / Lapsed |