Patent US3719209A successfully refreshed from Google Patents.
US3719209A
Expired / Lapsed
US
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Arcuate tubular articles of rigid plastic
Assignee: Beaton and Corbin Manufacturing Co
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Filing: 1970-09-23
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Granted: 1973-03-06
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Expires: 1990-09-23
Abstract
Abstract An improved method is disclosed for fabricating a rigid plastic tubular article having an integral arcuate portion along its tubular axis. Articles such as plumbing traps, waste bends, etc., manufactured by the method are also disclosed.
Inventors
- 👤 C Rush
- 👤 P Schurman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:45
CPC Classifications
B; B29; B29D; B29D23/00; B29D23/001; B29D23/003; B29C; B29C49/00; B29C49/02; B29C49/04; B29C49/42; B29C49/4273; B29C49/4278; B29C49/48; B29C49/4802; B29D23/006; E; E03; E03C; E03C1/00; E03C1/12; E03C1/28; E03C1/284; B29C2049/4805; B29C43/00; B29L; B29L2023/00; B29L2023/004; B29L2031/00; B29L2031/24; B29L2031/769; B29L2031/772; Y; Y10; Y10S; Y10S4/00; Y10S4/09
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
193 words
A tubular article of manufacture having an arcuate portion along its tubular axis produced by the method of a. extruding a tubular parison of heated thermoplastic resin and clamping said parison while still pliable between mating die members having cooperating mold cavities configured to the external shape of the article to be formed, said die members being partable along an axial plane of the article coincident with the axial plane of its arcuate portion; b. introducing a blow-molding duct into said die members and parison to provide communication internally of said plastic parison at a point adjacent an end of the tubular article to be formed, and introducing fluid under pressure through said duct while said parison is clamped between the closed die members in order to force the parison wall outwardly into contact with the surfaces of said mold cavities until the plastic has cooled sufficiently to rigidify; then c. parting said die members and stripping the molded tubular article from the die cavities said article, resulting as aforesaid from extruding a tubular parison of heated thermoplastic polymerized resin, being rigid and integrally formed with said arcuate portion along its tubular axis.
Claim 2
Dependent Claim
193 words
A tubular article of manufacture having an arcuate portion along its tubular axis produced by the method of a. extruding a tubular parison of heated thermoplastic resin and clamping said parison while still pliable between mating die members having cooperating mold cavities configured to the external shape of the article to be formed, said die members being partable along an axial plane of the article coincident with the axial plane of its arcuate portion; b. introducing a blow-molding duct into said die members and parison to provide communication internally of said plastic parison at a point adjacent an end of the tubular article to be formed, and introducing fluid under pressure through said duct while said parison is clamped between the closed die members in order to force the parison wall outwardly into contact with the surfaces of said mold cavities until the plastic has cooled sufficiently to rigidify; then c. parting said die members and stripping the molded tubular article from the die cavities said article, resulting as aforesaid from extruding a tubular parison of heated thermoplastic polymerized resin, being rigid and integrally formed with said arcuate portion along its tubular axis.
Claim 3
Dependent Claim
193 words
A tubular article of manufacture having an arcuate portion along its tubular axis produced by the method of a. extruding a tubular parison of heated thermoplastic resin and clamping said parison while still pliable between mating die members having cooperating mold cavities configured to the external shape of the article to be formed, said die members being partable along an axial plane of the article coincident with the axial plane of its arcuate portion; b. introducing a blow-molding duct into said die members and parison to provide communication internally of said plastic parison at a point adjacent an end of the tubular article to be formed, and introducing fluid under pressure through said duct while said parison is clamped between the closed die members in order to force the parison wall outwardly into contact with the surfaces of said mold cavities until the plastic has cooled sufficiently to rigidify; then c. parting said die members and stripping the molded tubular article from the die cavities said article, resulting as aforesaid from extruding a tubular parison of heated thermoplastic polymerized resin, being rigid and integrally formed with said arcuate portion along its tubular axis.
Claim 4
Dependent Claim
193 words
A tubular article of manufacture having an arcuate portion along its tubular axis produced by the method of a. extruding a tubular parison of heated thermoplastic resin and clamping said parison while still pliable between mating die members having cooperating mold cavities configured to the external shape of the article to be formed, said die members being partable along an axial plane of the article coincident with the axial plane of its arcuate portion; b. introducing a blow-molding duct into said die members and parison to provide communication internally of said plastic parison at a point adjacent an end of the tubular article to be formed, and introducing fluid under pressure through said duct while said parison is clamped between the closed die members in order to force the parison wall outwardly into contact with the surfaces of said mold cavities until the plastic has cooled sufficiently to rigidify; then c. parting said die members and stripping the molded tubular article from the die cavities said article, resulting as aforesaid from extruding a tubular parison of heated thermoplastic polymerized resin, being rigid and integrally formed with said arcuate portion along its tubular axis.
Claim 5
Dependent Claim
37 words
An integrally molded, rigid plastic, tubular article of manufacture as defined in claim 1, wherein said article comprises a plumbing J-tube having integrally formed threads in the wall of said tube at each of its opposite ends.
Claim 6
Dependent Claim
33 words
An integrally molded, rigid plastic, J-tube as defined in claim 2, wherein the wall of the tube in the thread area is of greater overall thickness than in the rest of the tube.
Claim 7
Dependent Claim
23 words
An integrally molded, rigid plastic, tubular article as defined in claim 1, wherein said article includes a linear portion along its tubular axis.
Claim 8
Dependent Claim
29 words
An integrally molded, rigid plastic, tubular article as defined in claim 4, wherein the linear portion is formed at an end of the arcuate portion and is tangential thereto.
References Cited (Backward Citations)
US3470900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |