US3823747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular member having a sealed longitudinal seam
Assignee: AT&T Inc
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Filing: 1972-08-02
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Granted: 1974-07-16
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Expires: 1992-08-02
Abstract
Abstract Successive portions of an aluminum tape having one major surface thereof coated with an adhesive copolymer across the entire transverse width thereof and the other major surface precoated with a stripe of adhesive material along an edge portion are folded longitudinally as the successive sections of the tape are being advanced along a predetermined path to form an overlapped seam so that the adhesive copolymer on an edge portion of the one major surface of the tape overlaps the stripe. Subsequently, the adhesive materials on the major surfaces along the overlapped seam develop an adhesive bond by the application of heat and pressure prior to or during the extrusion of a plastic jacket over the tape. The adhesive material on the other, now inwardly facing, major surface is substantially restricted in location and is adhesively bonded to the portion of the inwardly facing major surface of the tape which forms the overlapped seam with a portion of the one, now outwardly facing, major surface. The remaining portion of the inwardly facing major surface of the aluminum tape is bare and the resulting tubular member may be used in a variety of ways.
Inventors
- 👤 M Dembiak
- 👤 G Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:13
CPC Classifications
H; H01; H01B; H01B11/00; H01B11/02; H01B11/06; H01B11/10; H01B11/1016; F; F16; F16L; F16L9/00; F16L9/17; H01B9/00; H01B9/02; H01B9/022; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24744; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31855; Y10T428/31909
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
241 words
A tubular member, comprising: a metallic tape having inwardly and outwardly facing major surfaces and having at least one overlapped seam to form a tubular shape with the radius of curvature of the tape being substantially equal to the radius of curvature of the tubular shape; the tape having a first adhesive material precoated on the outwardly facing major surface of the tape across the entire transverse width thereof; and the tape further having a second adhesive material precoated on the inwardly facing major surface of the tape along an edge portion thereof and being substantially restricted in location to and adhesively bonded to portions of the inwardly facing major surface of the tape which forms the overlapped seam with a portion of the outwardly facing major surface, the remaining portion of the inwardly facing major surface of the tape being bare; an adhesive bond existing between the first and the second adhesive materials precoated on the portions of the major surfaces forming the overlapped seam; the adhesive materials on the outwardly and inwardly facing major surfaces capable of developing an adhesive bond along the overlapped seam at a predetermined temperature to seal the seam; the first and second adhesive materials composed essentially of ethylene acrylic acid copolymers, the second adhesive copolymer material having a melt index and an acrylic acid content which are substantially greater than the melt index and the acrylic acid content, respectively, of the first adhesive material.
Claim 2
Dependent Claim
244 words
A tubular member, comprising: a metallic tape having inwardly and outwardly facing major surfaces, the metallic tape having an overlapped seam to form a tubular shape with the radius of curvature of the tape substantially equal to the radius of curvature of the tubular shape; an extruded jacket of polymeric material surrounding the metallic tape; a first adhesive material precoated on the outwardly facing major surface of the metallic tape across the entire transverse width thereof; a second adhesive material precoated on the inwardly facing major surface of the metallic tape along an edge portion thereof and being substantially restricted in location to and adhesively bonded to portions of the inwardly facing major surface of the tape which forms the overlapped seam with a portion of the outwardly facing major surface, the remaining portion of the inwardly facing major surface of the tape being bare; and an adhesive bond existing between the adhesive materials along the overlapped seam; the adhesive materials on the major surfaces capable of developing an adhesive bond along the overlapped seam at a temperature less than the termperature at which the jackEt is extruded, further the first adhesive material being bonded to the jacket; the first and second adhesive materials composed essentially of ethylene acrylic acid copolymers, the second adhesive copolymer material having a melt index and an acrylic acid content which are substantially greater than the melt index and the acrylic acid content, respectively, of the first adhesive material.
Claim 3
Dependent Claim
44 words
The tubular member of claim 3, wherein the first adhesive material on the outwardly facing major surface capable of bonding to the second adhesive material on the inwardly facing major surface at a temperature less than the temperature at which the jacket is extruded.
Claim 4
Dependent Claim
22 words
The tubular member of claim 2, wherein the second adhesive material having a melting point which is higher than the predetermined temperature.
Claim 5
Dependent Claim
28 words
The tubular member of claim 2, wherein the thickness of the precoating of first adhesive material is substantially greater in thickness than the precoating of second adhesive material.
Claim 6
Dependent Claim
28 words
The tubular member as set forth in claim 6, wherein the second adhesive material is capable of being applied in the form of a solution to the tape.
Claim 7
Dependent Claim
36 words
The tubular member of claim 7, wherein the copolymer solution is a high melt index ethylene acrylic acid copolymer of greater than 15 per cent by weight acrylic acid in water solution which contains ammonium hydroxide.
Claim 8
Dependent Claim
25 words
The tubular member of claim 7, wherein the second adhesive material may be precoated onto the tape as a salt solution of an acrylic acid.
Claim 9
Dependent Claim
13 words
The tubular member of claim 9, wherein the salt is an ammonium salt.
Claim 10
Dependent Claim
14 words
The tubular member of claim 9, wherein the salt is an alkali metal salt.
References Cited (Backward Citations)
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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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |