Patent US4339185A successfully refreshed from Google Patents.
US3874418A
Expired / Lapsed
US
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Pipe coating
Assignee: Kendall Co
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Filing: 1974-01-07
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Granted: 1975-04-01
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Expires: 1994-01-07
Abstract
Abstract A method of coating a pipe and a pipe coated thereby, said method comprising the steps of progressively spirally winding a corrosion protective adhesive coated plastic tape onto the outer surface of the pipe with a spiral overlap, covering the coated pipe by progressively winding a film thereon with a predetermined overlap, and, as the film is wound onto the coated pipe, introducing and distributing under pressure a hot melted adhesive into intimate contact with the surface of the marginal portion of the trailing edge of the film and the surfaces of the overlapped portion along the leading edge thereof and of the portion of the tape immediately adjacent the leading edge of the film.
Inventors
- 👤 Ralph Hielema
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:35
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/02; F16L58/16; B; B29; B29C; B29C63/00; B29C63/02; B29C63/04; B29C63/08; B29C63/10; B29C65/00; B29C65/02; B29C65/40; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/12; B29C66/128; B29C66/1282; B29C66/12821; B29C66/1286; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/4329; B29C66/49; B29C66/496; B29C65/405; B29C66/70; B29C66/71; B29L; B29L2023/00; B29L2023/22; Y; Y10; Y10S; Y10S138/00; Y10S138/01; Y10T; Y10T428/00; Y10T428/24; Y10T428/24752
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
225 words
A PROTECTIVE COATED PIPE COMPRISING: A. A CONDUIT; B. A CORROSION PROTECTIVE INNER ADHESIVE COATED PLASTIC TAPE PROGESSIVELY WOUND ONTO AND ADHESIVELY SECURED TO THE ENTIRE OUTER SURFACE OF SAID CONDUIT AND HAVING A MARGINAL OVERLAP AT EACH ADJACENT TURN; C. A MECHANICAL PROTECTIVE FILM OF PLASTIC MATERIAL PROGRESSIVELY WOUND WITH A PREDETERMINED WRAPPING TENSION OVER SAID CORROSION PROTECTIVE TAPE WITH A TRAILING MARGINAL EDGE PORTION OF A SUBSEQUENT LAP OVERLAPPING A PORTION OF THE LEADING EDGE OF AN EARLIER LAP, TO FORM A MARGINAL OVERLAP WHEREBY A WEDGE-SHAPED REGION IS FORMED LYING BETWEEN THE OUTER SURFACE OF SAID CORROSION PROTECTIVE TAPE AND A PORTION OF SAID SUBSEQUENT LAP OF SAID MECHANICAL PROTECTIVE FILM, SAID WEDGE-SHAPED REGION BEING SPACED AXIALLY AHEAD OF SAID LEADING EDGE OF SAID EARLIER MECHANICAL PROTECTIVE FILM LAP; D. MEANS FOR BONDING SAID SUBSEQUENT LAP DIRECTLY TO SAID CORROSION PROTECTIVE TAPE IN SAID WEDGE-SHAPED REGION AND TO SAID EARLIER LAP IN THE AREA OF SAID MARGINAL OVERLAP; AND E. SAID BONDING MEANS INCLUDING A HOT MELT THERMOPLASTIC ADHESIVE COMPATIBLE WITH SAID TAPE AND FILM, SAID HOT MELT ADHESIVE SUBSTANTIALLY BEING APPLIED TO THE REGION OF SAID MARGINAL EDGE PORTION ONLY IN SUFFICIENT QUANTITY AND WIDTH TO FORM A UNITARY FUSED MASS BETWEEN SAID OVERLAPPING PORTIONS OF SAID MECHANICAL PROTECTIVE FILM AND BETWEEN SAID SUBSEQUENT LAP AND SAID UNDERLYING CORROSION PROTECTIVE TAPE.
Claim 2
Dependent Claim
225 words
A PROTECTIVE COATED PIPE COMPRISING: A. A CONDUIT; B. A CORROSION PROTECTIVE INNER ADHESIVE COATED PLASTIC TAPE PROGESSIVELY WOUND ONTO AND ADHESIVELY SECURED TO THE ENTIRE OUTER SURFACE OF SAID CONDUIT AND HAVING A MARGINAL OVERLAP AT EACH ADJACENT TURN; C. A MECHANICAL PROTECTIVE FILM OF PLASTIC MATERIAL PROGRESSIVELY WOUND WITH A PREDETERMINED WRAPPING TENSION OVER SAID CORROSION PROTECTIVE TAPE WITH A TRAILING MARGINAL EDGE PORTION OF A SUBSEQUENT LAP OVERLAPPING A PORTION OF THE LEADING EDGE OF AN EARLIER LAP, TO FORM A MARGINAL OVERLAP WHEREBY A WEDGE-SHAPED REGION IS FORMED LYING BETWEEN THE OUTER SURFACE OF SAID CORROSION PROTECTIVE TAPE AND A PORTION OF SAID SUBSEQUENT LAP OF SAID MECHANICAL PROTECTIVE FILM, SAID WEDGE-SHAPED REGION BEING SPACED AXIALLY AHEAD OF SAID LEADING EDGE OF SAID EARLIER MECHANICAL PROTECTIVE FILM LAP; D. MEANS FOR BONDING SAID SUBSEQUENT LAP DIRECTLY TO SAID CORROSION PROTECTIVE TAPE IN SAID WEDGE-SHAPED REGION AND TO SAID EARLIER LAP IN THE AREA OF SAID MARGINAL OVERLAP; AND E. SAID BONDING MEANS INCLUDING A HOT MELT THERMOPLASTIC ADHESIVE COMPATIBLE WITH SAID TAPE AND FILM, SAID HOT MELT ADHESIVE SUBSTANTIALLY BEING APPLIED TO THE REGION OF SAID MARGINAL EDGE PORTION ONLY IN SUFFICIENT QUANTITY AND WIDTH TO FORM A UNITARY FUSED MASS BETWEEN SAID OVERLAPPING PORTIONS OF SAID MECHANICAL PROTECTIVE FILM AND BETWEEN SAID SUBSEQUENT LAP AND SAID UNDERLYING CORROSION PROTECTIVE TAPE.
Claim 3
Dependent Claim
64 words
The coated pipe of claim 1 wherein said bonding means fills said wedge-shaped region such that it conforms to the wedge-shape and decreases in thickness from adjacent the leading edge of the earlier lap of said mechanical protective film, and said bonding means is thicker throughout a substantial portion of the wedge-shaped region than in the area of the overlapping earlier and subsequent laps.
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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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |