US3864182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a reinforced plastic apertured tube
Assignee: Plas/Steel Products Inc
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Filing: 1973-07-18
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Granted: 1975-02-04
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Expires: 1993-07-18
Abstract
Abstract A method of fabricating a reinforced plastic, apertured tube, such as a well screen, which includes the steps of providing an elongated strip of plastic material which will not bond to the plastic material from which the tube is formed, the strip having a base portion and an upstanding portion extending therefrom. The strip is wound on a mandrel with the base portion in engagement therewith and the upstanding portion forming a generally helical groove, and circumferentially spaced, longitudinally extending grooves are formed in the upstanding portion of the thus-wound strip. A multi-filament glass strand pre-wetted with heathardenable plastic material is wound in the helical groove and lengths of such strand are placed in the longitudinal grooves so as substantially to fill the helical and longitudinal grooves. The plastic material is then hardened while the strand and lengths are in the grooves and the strip is on the mandrel thereby to form a glass-reinforced plastic tube surrounding the base portion of the strip and with the upstanding portion of the strip embedded in the wall of the tube. The mandrel is then removed from the interior of the base portion of the wound strip and the strip is removed from the interior of the tube, removal of the upstanding portion of the strip from the wall of the tube leaving apertures therein.
Inventors
- 👤 Samuel M Shobert
- 👤 Bernard L Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:58
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/54; B29C70/545; B29C33/00; B29C33/0033; B29C53/00; B29C53/56; B29C53/58; B29C53/583; B29C53/587; B29C53/80; B29C53/8008; B29C53/805; B29C70/30; B29C70/34; B29C70/347; B29D; B29D28/00; B29D28/005; B65; B65H; B65H81/00; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0658; B29K2023/0683; B29K2309/00; B29K2309/08; B29K2827/00; B29K2827/12; B29K2827/18; B29L; B29L2031/00; B29L2031/737
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
198 words
The method of fabricating an apertured tube comprising the steps of: a. providing an elongated flexible strip proportioned and arranged to be wound on a mandrel, said strip having a base portion with an upstanding portion extending therefrom, b. winding said strip on a mandrel with said base portion in engagement therewith and said upstanding portion forming a generally helical groove, c. forming circumferentially spaced, longitudinally extending grooves in said upstanding portion of the thus-wound strip, d. winding multi-filament glass strands pre-wetted with hardenable plastic material in said helical groove and placing lengths of such strand in said longitudinal grooves so as substantially to fill said helical and longitudinal grooves, e. hardening said plastic material while said strands and lengths are in said grooves and said strip is on said mandrel thereby to form a glass-fiber reinforced plastic tube surrounding said base portion of said strip and with said upstanding portion embedded in the wall of said tube, f. removing said mandrel from the interior of said base portion of the wound strip, and g. removing said strip from the interior of said tube, removal of said upstanding portion from the wall of said tube leaving apertures therein.
Claim 2
Independent Claim
198 words
The method of fabricating an apertured tube comprising the steps of: a. providing an elongated flexible strip proportioned and arranged to be wound on a mandrel, said strip having a base portion with an upstanding portion extending therefrom, b. winding said strip on a mandrel with said base portion in engagement therewith and said upstanding portion forming a generally helical groove, c. forming circumferentially spaced, longitudinally extending grooves in said upstanding portion of the thus-wound strip, d. winding multi-filament glass strands pre-wetted with hardenable plastic material in said helical groove and placing lengths of such strand in said longitudinal grooves so as substantially to fill said helical and longitudinal grooves, e. hardening said plastic material while said strands and lengths are in said grooves and said strip is on said mandrel thereby to form a glass-fiber reinforced plastic tube surrounding said base portion of said strip and with said upstanding portion embedded in the wall of said tube, f. removing said mandrel from the interior of said base portion of the wound strip, and g. removing said strip from the interior of said tube, removal of said upstanding portion from the wall of said tube leaving apertures therein.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein said strip is formed of material which will not bond to said plastic material.
Claim 4
Dependent Claim
47 words
The method of claim 2 wherein said step (a) includes making transverse radial cuts in said upstanding portion of said strip at spaced intervals thereby to divide the same into segments each having an outer end, said segment ends being circumferenTially spaced-apart following said winding step (b).
Claim 5
Dependent Claim
86 words
The method of claim 3 wherein said winding and placing step (d) includes winding said strands to a depth completely to cover said segment ends, and comprising the further step (h) following said hardening step (e) and prior to said mandrel removing step (f) of removing material from the outer surface of said tube at least to a depth to expose the space formed by said segment ends whereby said apertures extend through the wall of said tube upon completion of said strip removing step (g).
Claim 6
Dependent Claim
28 words
The method of claim 4 wherein said mandrel is cylindrical whereby said tube is cylindrical, said material removing step (h) comprising grinding said outer surface of said tube.
Claim 7
Dependent Claim
37 words
The method of claim 1 wherein said upstanding portion of said strip comprises a pair of relatively narrow, upstanding flanges defining a slot therebetween, said winding and placing step (d) including winding said strands in said slot.
Claim 8
Dependent Claim
24 words
The method of claim 1 wherein said base portion of said strip has side edges which are abutting following said strip winding step (b).
Claim 9
Dependent Claim
15 words
The method of claim 1 wherein said winding and placing steps (d) are alternately performed.
Claim 10
Dependent Claim
169 words
The method of claim 1 wherein said strip is formed of extruded plastic material which will not bond to said hardenable plastic material, said first step (a) including making transverse cuts in said upstanding portion of said strip at spaced intervals thereby to divide the same into segments each having an outer end, said segment ends being circumferentially spaced-apart following said winding step (b), said mandrel being cylindrical whereby said tube is cylindrical, said base portion of said strip having side edges which are abutting following said strip winding step (b), said winding and placing step (d) including winding said strands to a depth completely to cover said segment ends, and comprising the further step (h) following said hardening step (e) and prior to said mandrel removing step (f) of grinding the outer surface of said tube to remove material therefrom at least to a depth to expose said segment ends whereby said apertures extend through the wall of said tube upon completion of said strip removing step (g).
Claim 11
Independent Claim
96 words
The method of fabricating an apertured tube comprising the steps of: a. in any order, placing an elongated coiled strip on a mandrel, and forming slots in said strip, b. filling said slots with glass-fiber strand material and surrounding said strip and filled slots with further such strand material, c. impregnating said strand material with hardenable plastic material, d. hardening said plastic material thereby to form a glass-reinforced plastic tube having said strip embedded therein, e. removing said tube and embedded strip from said mandrel, and f. removing said strip from the interior of said tube.
Claim 12
Independent Claim
96 words
The method of fabricating an apertured tube comprising the steps of: a. in any order, placing an elongated coiled strip on a mandrel, and forming slots in said strip, b. filling said slots with glass-fiber strand material and surrounding said strip and filled slots with further such strand material, c. impregnating said strand material with hardenable plastic material, d. hardening said plastic material thereby to form a glass-reinforced plastic tube having said strip embedded therein, e. removing said tube and embedded strip from said mandrel, and f. removing said strip from the interior of said tube.
Claim 13
Independent Claim
89 words
The method of fabricating an apertured tube comprising the steps of: a. forming a hollow sleeve of plastic material having a plurality of peripherally exposed slots therein and separable flexible portions which may be flexed inwardly, b. placing glass-fiber material in said slots, c. impregnating said glass-fiber material with hardenable plastic of a composition that does not bond to the plastic material of said sleeve, d. hardening said hardenable plastic, and e. physically removing said plastic sleeve from said hardened plastic by flexing said separable portions radially inwardly thereof.
Claim 14
Independent Claim
89 words
The method of fabricating an apertured tube comprising the steps of: a. forming a hollow sleeve of plastic material having a plurality of peripherally exposed slots therein and separable flexible portions which may be flexed inwardly, b. placing glass-fiber material in said slots, c. impregnating said glass-fiber material with hardenable plastic of a composition that does not bond to the plastic material of said sleeve, d. hardening said hardenable plastic, and e. physically removing said plastic sleeve from said hardened plastic by flexing said separable portions radially inwardly thereof.
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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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |