Patent US5466222A successfully refreshed from Google Patents.
US3765979A
Expired / Lapsed
US
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System for the formation of pipe fittings by the winding of resin impregnated filaments around a mandrel
Assignee: J-M MANUFACTURING Co COMPANY Inc A CORP OF
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Filing: 1971-12-06
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Granted: 1973-10-16
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Expires: 1991-12-06
Abstract
Abstract A system for forming pipe fittings having at least a pair of tubular sections by the winding of resin impregnated filaments around a mandrel wherein the mandrel''s outside configuration at the intersection of said tubular sections is in the form of a bulge which, in the preferred embodiments, comprises an ellipsoid or a sphere.
Inventors
- 👤 J Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:55
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/80; B29C53/82; B29C53/821; B29C53/824; B29C53/56; B29C53/58; B29C53/76; F; F16; F16L; F16L41/00; F16L41/02; F16L41/021; F16L47/00; F16L47/26; F16L47/32; F16L58/00; F16L58/02; F16L58/04; F16L58/10; F16L58/1054; F16L58/1063; F16L58/18; F16L58/188
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
192 words
In the method for forming pipe fittings in which resin impregnated filaments are wound around an integral mandrel having at least two tubular sections with longitudinal axes which if extended would intersect, the resin impregnated filaments are cured after the mandrel is wound, and the mandrel is removed from the pipe fitting formed, the improvement comprising: a. providing a mandrel having at least two tubular sections connected by a body portion wherein said body portion has a bulging exterior surface and wherein for all of said tubular sections the radial distance from an extended axis of any one of said tubular sections to any point on said bulging exterior surface of said body portion that is located adjacent said one tubular section is greater than the radial distance from the axis of said one tubular section to any point on an exterior surface of said one tubular section that is located adjacent said body portion, b. rotating the mandrel about the axes of said tubular sections, and c. wrapping resin impregnated filaments on said tubular sections and said body portion while the mandrel is being rotated until a pipe fitting is formed.
Claim 2
Dependent Claim
192 words
In the method for forming pipe fittings in which resin impregnated filaments are wound around an integral mandrel having at least two tubular sections with longitudinal axes which if extended would intersect, the resin impregnated filaments are cured after the mandrel is wound, and the mandrel is removed from the pipe fitting formed, the improvement comprising: a. providing a mandrel having at least two tubular sections connected by a body portion wherein said body portion has a bulging exterior surface and wherein for all of said tubular sections the radial distance from an extended axis of any one of said tubular sections to any point on said bulging exterior surface of said body portion that is located adjacent said one tubular section is greater than the radial distance from the axis of said one tubular section to any point on an exterior surface of said one tubular section that is located adjacent said body portion, b. rotating the mandrel about the axes of said tubular sections, and c. wrapping resin impregnated filaments on said tubular sections and said body portion while the mandrel is being rotated until a pipe fitting is formed.
Claim 3
Dependent Claim
81 words
The improvement as defined in claim 1 and further comprising: a. rotating said mandrel about the axis of said one tubular section, b. subsequently rotating said mandrel about the axis of each of said tubular sections which is not coaxial with said one tubular section, and c. wrapping resin impregnated filaments on said tubular sections when said tubular sections are coaxial with the axis of rotation of said mandrel while also wrapping said body portion until a pipe fitting is formed.
Claim 4
Dependent Claim
14 words
A reinforced plastic pipe fitting formed in accordance with the method of claim 1.
Claim 5
Dependent Claim
166 words
In apparatus for use in the formation of a pipe fitting wherein resin impregnated filaments are wound around a mandrel, said mandrel having at least two tubular sections having longitudinal axes which, if extended, would intersect, said mandrel being adapted to be removed from the formed fitting, and said apparatus including means for wrapping said resin impregnated filaments around said mandrel, the improvement in said mandrel comprising: a. said mandrel having a body portion connecting said tubular sections into an integral unit, and b. said body portion having a bulging exterior surface wherein for all of said tubular sections the radial distance from an extended axis of any one of said tubular sections to any point on said bulging exterior surface of said body portion that is located adjacent said one tubular section is greater than the radial distance from the axis of said one tubular section to any point on an exterior surface of said one tubular section that is located adjacent said body portion.
Claim 6
Dependent Claim
166 words
In apparatus for use in the formation of a pipe fitting wherein resin impregnated filaments are wound around a mandrel, said mandrel having at least two tubular sections having longitudinal axes which, if extended, would intersect, said mandrel being adapted to be removed from the formed fitting, and said apparatus including means for wrapping said resin impregnated filaments around said mandrel, the improvement in said mandrel comprising: a. said mandrel having a body portion connecting said tubular sections into an integral unit, and b. said body portion having a bulging exterior surface wherein for all of said tubular sections the radial distance from an extended axis of any one of said tubular sections to any point on said bulging exterior surface of said body portion that is located adjacent said one tubular section is greater than the radial distance from the axis of said one tubular section to any point on an exterior surface of said one tubular section that is located adjacent said body portion.
Claim 7
Dependent Claim
23 words
The improvement as defined in claim 4 wherein: a. the ratio of body portion diameter to tubular section diameter is at least 7:5.
Claim 8
Dependent Claim
19 words
The improvement as defined in claim 4 wherein: a. the bulging exterior surface of said body portion is spherical.
Claim 9
Dependent Claim
23 words
The improvement as defined in claim 6 wherein: a. the ratio of body portion diameter to tubular section diameter is at least 7:5.
Claim 10
Dependent Claim
23 words
The improvement as defined in claim 6 wherein: a. the center of said body portion is offset from the intersection of said axes.
Claim 11
Dependent Claim
19 words
The improvement as defined in claim 4 wherein: a. the bulging exterior surface of said body portion is ellipsoidal.
Claim 12
Dependent Claim
23 words
The improvement as defined in claim 9 wherein: a. the ratio of body portion diameter to tubular section diameter is at least 7:5.
Claim 13
Dependent Claim
23 words
The improvement as defined in claim 9 wherein: a. the center of said body portion is offset from the intersection of said axes.
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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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |