US3610291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective covering and article
Assignee: Raychem Corp
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Filing: 1968-12-08
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Granted: 1971-10-05
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Expires: 1988-12-08
Abstract
Abstract The present invention relates to a means and process for protecting pipe and similar articles against corrosion and other damage by applying a protective coating thereto. The present invention relates to a means and process which are particularly suitable for protecting pipe joints and the like, but which have a wide variety of other applications.
Inventors
- 👤 William Rosse Heslop
- 👤 Vincent L Lanza
- 👤 Edward C Stivers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:48
CPC Classifications
F; F16; F16L; F16L47/00; F16L47/20; F16L47/22; F16L58/00; F16L58/18; F16L58/181
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
The pipe of claim 1 in which said wax is a mixture of beeswax and rosin providing good adhesion characteristics of said mastic.
Claim 2
Dependent Claim
93 words
A corrosion resistant pipe comprising a pipe to be protected, a layer of mastic adjacent to and in contact with said pipe, said mastic having wax dissolved therein as a part of said mastic, and a water impervious layer of an elastic memory material adjacent to and in contact with said mastic layer, said elastic memory material having a coefficient of thermal expansion greater than that of said pipe, said mastic being capable of flowing at ordinary temperatures on the surface of said pipe under the pressure exerted by said elastic memory material.
Claim 3
Dependent Claim
93 words
A corrosion resistant pipe comprising a pipe to be protected, a layer of mastic adjacent to and in contact with said pipe, said mastic having wax dissolved therein as a part of said mastic, and a layer of water resistant irradiated polyolefin having the property of elastic memory adjacent to and in contact with said mastic layer, said polyolefin having a coefficient of thermal expansion greater than that of said pipe, said mastic being capable of flowing at ordinary temperatures on the surface of said pipe under the pressure exerted by said polyolefin.
Claim 4
Dependent Claim
10 words
The pipe of claim 4 wherein said polyolefin is polyethylene.
Claim 5
Dependent Claim
19 words
The pipe of claim 4 wherein said elastic memory material is a copolymer of ethylene and an alkyl acrylate.
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |