Patent US3768841A successfully refreshed from Google Patents.
US3768841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic pipe joint
Assignee: Honeywell International Inc
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Filing: 1970-10-02
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Granted: 1973-10-30
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Expires: 1990-10-02
Abstract
Abstract An improved heat fused pipe assembly joint is provided using an internally positioned fitting having an annular insert portion substantially the same diameter as the internal diameter of the pipe section to be joined and a shoulder portion having a larger diameter. The pipe section is joined to the fitting by heating the pipe end sufficiently to soften it, heating the insert portion of the fitting so as to soften its exterior wall, inserting the fitting so that the end edge of the pipe section substantially abuts the shoulder portion of the fitting and crimping to cause fusion of the pipe to the fitting. For additional strength, the fused pipe joint assembly may be provided with an externally positioned sleeve.
Inventors
- 👤 M Byrne
- 👤 D Powelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:53
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/50; B29C66/63; B29C66/636; B29C65/00; B29C65/02; B29C66/01; B29C66/05; B29C66/10; B29C66/12; B29C66/124; B29C66/1244; B29C66/12441; B29C66/51; B29C66/52; B29C66/522; B29C66/5221; B29C66/5229; B29C66/52291; B29C66/52298; B29C66/70; B29C66/71; B29C66/73; B29C66/731; B29C66/7313; F; F16; F16L; F16L13/00; F16L47/00; F16L47/02; B29C65/18; B29C65/20; B29K; B29K2009/00; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0658; B29K2023/0683; B29K2023/18; B29K2023/22; B29K2061/00; B29K2061/04; B29K2096/00; B29K2096/02; B29K2105/00; B29K2105/0085; B29L; B29L2031/00; B29L2031/24; B29L2031/243; B29L2031/246
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
196 words
A heat fused polyethylene pipe joint assembly comprising an end portion of a pipe section of polyethylene having a molecular weight of between about 400,000 to about 1,500,000 and a density of about 0.937-0.965 fused to the insert portion of an annular insert fitting, said fitting having an insert portion whose outer diameter is substantially the same as the inner diameter of said pipe and a shoulder portion having an outer diameter larger than the inner diameter of said pipe, positioned so that the edge of said pipe section substantially abuts the leading edge of said shoulder portion, the fitting being preformed of a polymer reaction product of a polyethylene polymer or copolymer having a molecular weight of at least about 8,000, a density of 0.940 0.950, with from about 5.0 to 15.0 percent by weight of the polyethylene of a butyl rubber and from about 0.30 to about 2.5 percent by weight of the polyethylene of a bifunctional phenolic composition having ortho functionality and the para position of the phenol ring substituted with an inert hydrocarbon radical selected from the group consisting of alkyl, aryl, alkaryl and aralkyl radicals of up to 16 carbon atoms.
Claim 2
Dependent Claim
196 words
A heat fused polyethylene pipe joint assembly comprising an end portion of a pipe section of polyethylene having a molecular weight of between about 400,000 to about 1,500,000 and a density of about 0.937-0.965 fused to the insert portion of an annular insert fitting, said fitting having an insert portion whose outer diameter is substantially the same as the inner diameter of said pipe and a shoulder portion having an outer diameter larger than the inner diameter of said pipe, positioned so that the edge of said pipe section substantially abuts the leading edge of said shoulder portion, the fitting being preformed of a polymer reaction product of a polyethylene polymer or copolymer having a molecular weight of at least about 8,000, a density of 0.940 0.950, with from about 5.0 to 15.0 percent by weight of the polyethylene of a butyl rubber and from about 0.30 to about 2.5 percent by weight of the polyethylene of a bifunctional phenolic composition having ortho functionality and the para position of the phenol ring substituted with an inert hydrocarbon radical selected from the group consisting of alkyl, aryl, alkaryl and aralkyl radicals of up to 16 carbon atoms.
Claim 3
Dependent Claim
25 words
A pipe joint assembly according to claim 1 wherein the polymer of ethylene has a molecular weight in the range from 400, 000 to 1,000,000.
Claim 4
Dependent Claim
39 words
A pipe joint assembly according to claim 1 wherein the butyl rubber is a copolymer of isobutylene and up to 15 percent by weight of a diolefin of four to eight carbon atoms having 0.75 to 3 percent unsaturation.
Claim 5
Dependent Claim
13 words
A pipe joint assembly according to claim 3 wherein the diolefin is isoprene.
Claim 6
Dependent Claim
24 words
A pipe joint assembly according to claim 4 wherein the isoprene is present in an amount of 1-8 percent by weight of the copolymer.
Claim 7
Dependent Claim
19 words
A pipe joint assembly according to claim 1 wherein the phenolic composition is a polymer of a phenol dialcohol.
Claim 8
Dependent Claim
20 words
A pipe joint assembly according to claim 1 wherein the phenolic composition is a monobrominated polymer of a phenol dialcohol.
Claim 9
Dependent Claim
46 words
A pipe joint assembly according to claim 1 wherein the butyl rubber is a copolymer of isobutylene and from 1 to 8 percent by weight of isoprene having 0.75 percent to 3 percent unsaturation, and the phenolic composition is a monobrominated polymer of a phenol dialcohol.
Claim 10
Dependent Claim
15 words
A pipe joint assembly according to claim 1 additionally fitted with an externally positioned sleeve.
Claim 11
Dependent Claim
26 words
A pipe joint assembly according to claim 9 wherein the sleeve is preformed from a thermoplastic material having a tensile modulus of at least 400,000 psi.
References Cited (Backward Citations)
US1996069A
Cited
US2364192A
Cited
US2725246A
Cited
US2842125A
Cited
DE1014803B
Cited
US3219728A
Cited
NL6601024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |