US3282301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lined pipe construction
Assignee: W S DICKEY CLAY MANUFACTURING Co
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Filing: 1964-06-15
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Granted: 1966-11-01
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Expires: 1984-06-15
Abstract
No abstract record available.
Inventors
- 👤 Elmer R Ligon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:17
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/14; F16L59/00; F16L59/02; F16L59/029
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A PIPE STRUCTURE COMPRISING: (A) AN OUTER SHELL OF CONCRETE HAVING AN EXTERNAL AND AN INTERNAL SURFACE, (B) AN INNER CYLINDRICAL SHELL SPACED RADIALLY INWARDLY OF SAID OUTER SHELL AND INCLUDING SPACED APART LINER PLATES FORMING GROOVES THEREBETWEEN, SAID LINER PLATES EACH HAVING AN INWARDLY DIRECTED FLOW SURFACE AND AN OUTER SURFACE, AND
Claim 2
Dependent Claim
53 words
A PIPE STRUCTURE COMPRISING: (A) AN OUTER SHELL OF CONCRETE HAVING AN EXTERNAL AND AN INTERNAL SURFACE, (B) AN INNER CYLINDRICAL SHELL SPACED RADIALLY INWARDLY OF SAID OUTER SHELL AND INCLUDING SPACED APART LINER PLATES FORMING GROOVES THEREBETWEEN, SAID LINER PLATES EACH HAVING AN INWARDLY DIRECTED FLOW SURFACE AND AN OUTER SURFACE, AND
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) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |