Patent US2767431A successfully refreshed from Google Patents.
US2767431A
Expired / Lapsed
US
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Method and apparatus for providing a permeable tube with an impermeable lining
Assignee: Individual
•
Filing: 1954-09-07
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Granted: 1956-10-23
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Expires: 1974-09-07
Abstract
No abstract record available.
Inventors
- 👤 Laubarede Leonce Kraffe De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:52
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/15; B29C48/151; B29C48/152; B29C48/153; B29C48/03; B29C48/09; B29C48/10; Y; Y10; Y10S; Y10S118/00; Y10S118/10; Y10T; Y10T442/00; Y10T442/60; Y10T442/674
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |