US2596490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe and method of making same
Assignee: American Pipe and Construction Co
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Filing: 1948-08-10
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Granted: 1952-05-13
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Expires: 1968-08-10
Abstract
No abstract record available.
Inventors
- 👤 Fred F Jenkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:26
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/70; B28B21/72; B28B21/42; B28B21/44; B28B21/56; B28B21/58
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
48 words
A COMPOSITE CONCRETE STEEL SHELL PIPE COMPRISING A STEEL SHELL HAVING AN INNER LINING OF CONCRETE, A THIN COATING OF NEAT HYDRAULIC CEMENT ON THE EXTERIOR OF SAID SHELL, AND A LAYER OF HYDRAULIC CEMENT MORTAR OVER SAID COATNG, SAID MORTAR ORIGINALLY HAVING HAD A LOW WATER/CEMENT RATIO.
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) | 1955-05-13 | 1955-11-12 | 1956-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-13 | 1959-11-12 | 1960-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-13 | 1963-11-12 | 1964-05-13 | $7700.00 | Window Closed / Lapsed |