US3087515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impermeable barrier in cement lined pipe
Assignee: Phillips Petroleum Co
•
Filing: 1960-07-11
•
Granted: 1963-04-30
•
Expires: 1980-07-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles R Venable
- 👤 Roy S Ladley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:08
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/02; F16L58/04; F16L58/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/4987; Y10T29/49885
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A LINED METAL PIPE COMPRISING A METAL LAYER, A CEMENT INNER LINING WITHIN THE METAL LAYER, A FLEXIBLE IMPERMEABLE MEMBRANE BETWEEN THE CEMENT LINING AND THE METAL PIPE AND A THIN HYDRAULIC CEMENT LAYER SECURING THE IMPERMEABLE LAYER TO THE METAL PIPE.
Claim 2
Dependent Claim
42 words
A LINED METAL PIPE COMPRISING A METAL LAYER, A CEMENT INNER LINING WITHIN THE METAL LAYER, A FLEXIBLE IMPERMEABLE MEMBRANE BETWEEN THE CEMENT LINING AND THE METAL PIPE AND A THIN HYDRAULIC CEMENT LAYER SECURING THE IMPERMEABLE LAYER TO THE METAL PIPE.
References Cited (Backward Citations)
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US1570445A
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US1979655A
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US2230626A
Cited
US2597706A
Cited
US2677165A
Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |