US2468154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permeability determination
Assignee: AT&T Inc
•
Filing: 1943-10-05
•
Granted: 1949-04-26
•
Expires: 1963-10-05
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Ashworth
- 👤 Raymond A Chegwidden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:47
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/12; G01R33/1223
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1005857A
Cited
FR439495A
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US1066293A
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US1394910A
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US1440470A
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US1739277A
Cited
US2010813A
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US2114189A
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US2245568A
Cited
US2226275A
Cited
US2307446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-25 | 1952-10-25 | 1953-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-25 | 1956-10-25 | 1957-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-25 | 1960-10-25 | 1961-04-26 | $7700.00 | Window Closed / Lapsed |