US4290456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic pipe stub end
Assignee: DuPont Canada Inc
•
Filing: 1977-07-13
•
Granted: 1981-09-22
•
Expires: 1997-07-13
Abstract
Abstract An improved thermoplastic pipe stub end for welding to thermoplastic pipe is disclosed. The stub end has a flange portion integrally joined to a neck portion which has inner and outer surfaces and terminates at a welding face. The improvement resides in the reduction of the length of neck portion such that it extends from the flange a distance in millimeters of not greater than 1.5 2ROOT O.D., where O.D. is the outer diameter in centimeters of the neck portion at the welding face. The improved stub end permits higher strength heat welds to be made by butt fusion between the thermoplastic stub end and a thermoplastic pipe to be joined thereto.
Inventors
- 👤 Harold Ahrbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:00
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/20; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/12; B29C66/122; B29C66/1222; B29C66/1224; B29C66/13; B29C66/131; B29C66/50; B29C66/51; B29C66/53; B29C66/534; B29C66/5344; F; F16; F16L; F16L47/00; F16L47/02; B29C66/70; B29C66/71; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91411; B29C66/91421; B29C66/91431; B29C66/919; B29C66/92; B29C66/924; B29C66/9241; B29C66/929
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
An improved thermoplastic pipe stub end having a flange portion integrally joined to a neck portion, the neck portion having inner and outer surfaces and terminating at a welding face, the improvement comprising the neck portion extending from the flange a length in millimeters of not greater than 1.5√O.D., where O.D. is the outer diameter in centimeters of the neck portion at the welding face.
Claim 2
Dependent Claim
65 words
An improved thermoplastic pipe stub end having a flange portion integrally joined to a neck portion, the neck portion having inner and outer surfaces and terminating at a welding face, the improvement comprising the neck portion extending from the flange a length in millimeters of not greater than 1.5√O.D., where O.D. is the outer diameter in centimeters of the neck portion at the welding face.
Claim 3
Dependent Claim
29 words
The thermoplastic pipe stub end according to claim 1 wherein the neck portion extends from the flange a length in millimeters in the range of from 0.3√O.D. to 1.2√O.D..
Claim 4
Dependent Claim
31 words
The thermoplastic pipe stub end according to claim 1, wherein the neck portion extends from the flange a length in millimeters in the range of from 0.5 √O.D. to 1.0 √O.D..
Claim 5
Dependent Claim
64 words
The thermoplastic pipe stub end according to claim 3, wherein an annular locating lip projects from the welding face at the inner surface of the neck portion, the locating lip being adapted to fit in an end of a thermoplastic pipe to aid in the coaxial alignment of the stub end and the pipe prior to heat welding the stub end to the pipe.
Claim 6
Dependent Claim
21 words
The thermoplastic pipe stub end according to any one of claim 1, wherein the stub end is made from a polyolefin.
Claim 7
Dependent Claim
21 words
The thermoplastic pipe stub end according to any one of claim 1, wherein the stub end is made from a polyethylene.
Claim 8
Dependent Claim
46 words
The thermoplastic pipe stub end according to any one of claim 1, wherein the stub end is made from a polyethylene having a density in the range of from 0.938 to 0.944 g/cm 3 and a melt index in the range of 0.15 to 0.4 dg/min.
References Cited (Backward Citations)
US2412487A
Cited
US2453849A
Cited
US2535437A
Cited
US2857175A
Cited
US2933428A
Cited
US3324894A
Cited
US3848421A
Cited
US3850459A
Cited
US3989283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |