Patent US2501869A successfully refreshed from Google Patents.
US2501869A
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US
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Assignee: AT&T Inc
•
Filing: 1946-05-23
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Granted: 1950-03-28
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Expires: 1966-05-23
Abstract
No abstract record available.
Inventors
- 👤 Alton L Loucks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:25
CPC Classifications
F; F16; F16K; F16K21/00; F16K21/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1593695A
Cited
US1898147A
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US1160790A
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US1297446A
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US1536874A
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US1531365A
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US1567537A
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US1565485A
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US1892260A
Cited
US2123354A
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US2218811A
Cited
US2310516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |