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US3381718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lined concrete pipe
Assignee: Individual
•
Filing: 1963-11-01
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Granted: 1968-05-07
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Expires: 1983-11-01
Abstract
No abstract record available.
Inventors
- 👤 Darrow Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:18
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/02; F16L58/04; F16L58/10; F16L58/1009; F16L58/1027; B; B28; B28B; B28B19/00; B28B19/0023; B29; B29C; B29C63/00; B29C63/26; B29C63/28; Y; Y10; Y10S; Y10S52/00; Y10S52/07; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317; Y10T428/1321; Y10T428/24; Y10T428/24744; Y10T428/31504; Y10T428/31511; Y10T428/31515
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A LINED CONCRETE PIPE HAVING A FACING LINER COVERING AT LEAST A MAJOR PORTION OF THE INSIDES SURFACE THEREOF TO PROTECT THE CONCRETE AGAINST CORROSIVE ACTION OF ACIDS, GASES OR ALKALI, AND A COATING OF EPOXY RESIN ADHESIVE BONDING SAID LINER TO THE INSIDE SURFACE OF SAID CONCRETE PIPE, SAID FACING LINER COMPRISING A PLURALITY OF PLIES BONDED TOGETHER TO FORM A LAMINATED SHEET INCLUDING AT LEAST A PAIR OF THIN PLIES OF A PREVIOUSLY SET OR POLYMERIZED VINYL PLASTIC SHEET MATERIAL WHICH IS RESISTANT TO CORROSIVE ACTION OF OXIDIZED HYDROGEN SULFIDE AND A PLY OF FABRIC BACKING MATERIAL BONDED TO THE PLASTIC SHEET MATERIAL AND DISPOSED IMMEDIATELY ADJACENT THE INSIDE SURFACE OF THE PIPE AND HAVING THE PROPERTY OF DISPLAYING A GREATER BONDING AFFINITY TO THE EPOXY RESIN ADHESIVE THAN SAID VINYL PLASTIC SHEET MATERIAL.
Claim 2
Dependent Claim
136 words
A LINED CONCRETE PIPE HAVING A FACING LINER COVERING AT LEAST A MAJOR PORTION OF THE INSIDES SURFACE THEREOF TO PROTECT THE CONCRETE AGAINST CORROSIVE ACTION OF ACIDS, GASES OR ALKALI, AND A COATING OF EPOXY RESIN ADHESIVE BONDING SAID LINER TO THE INSIDE SURFACE OF SAID CONCRETE PIPE, SAID FACING LINER COMPRISING A PLURALITY OF PLIES BONDED TOGETHER TO FORM A LAMINATED SHEET INCLUDING AT LEAST A PAIR OF THIN PLIES OF A PREVIOUSLY SET OR POLYMERIZED VINYL PLASTIC SHEET MATERIAL WHICH IS RESISTANT TO CORROSIVE ACTION OF OXIDIZED HYDROGEN SULFIDE AND A PLY OF FABRIC BACKING MATERIAL BONDED TO THE PLASTIC SHEET MATERIAL AND DISPOSED IMMEDIATELY ADJACENT THE INSIDE SURFACE OF THE PIPE AND HAVING THE PROPERTY OF DISPLAYING A GREATER BONDING AFFINITY TO THE EPOXY RESIN ADHESIVE THAN SAID VINYL PLASTIC SHEET MATERIAL.
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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) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |