Patent US4365669A successfully refreshed from Google Patents.
US4365669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-solvent bonded plastic well screen assembly
Assignee: Wheelabrator Clean Water Inc
•
Filing: 1981-01-29
•
Granted: 1982-12-28
•
Expires: 2001-01-29
Abstract
Abstract Improved method of joining a rigid thermoplastic fitting to a rigid thermoplastic well screen having longitudinal support rods utilizes pressure and friction generated heat to bond a reduced diameter tubular, rigid thermoplastic sleeve portion of the fitting to the inner surface of the screen. The method permits the joining, without the use of solvents, of screens and fittings of PVC, polypropylene, or ABS, for example, which have the same outer diameters. The sleeve portion of the fitting has an outer diameter which is greater than the inner diameter of the well screen. The assembly method requires that the parts to be mated be rotated rapidly relative to each other as they are forced axially into interfering, telescopic engagement. The overlapping members are fused along a generally conically tapered plane with the material which is melted during rotation being deposited in the circumferential spaces between the screen's support rods.
Inventors
- 👤 Walter R. Wagner
- 👤 Henry E. Benson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:15
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/06; B29C65/0672; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/12; B29C66/122; B29C66/1224; B29C66/1226; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5229; B29C66/52291; B29C66/52293; B29C66/53; B29C66/534; B29C66/5344; B29C66/61; B29C66/612; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; E; E21; E21B; E21B43/00; E21B43/02; E21B43/08; E21B43/088; B29C66/70; B29C66/71; B29K; B29K2009/00; B29K2009/06; B29K2023/00; B29K2023/10; B29K2023/12; B29K2027/00; B29K2027/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
153 words
A non-solvent bonded assembly of a rigid thermoplastic well screen formed of helical wire wraps bonded to a series of circumferentially spaced longitudinal rods and at least one end fitting characterized in that the end fitting and well screen have substantially the same outer diameter, while the fitting has a reduced diameter inner sleeve portion which is telescopically received within one end of the well screen and intimately fused thereto, the plane of fusion between said sleeve portion and said well screen being generally conically tapered along the major portion of the region of telescopic overlap, said sleeve portion having a maximum outer diameter which is greater than the minimum inner diameter of the well screen, said assembly having a fused mixture of the plastic of the sleeve portion and the plastic of the longitudinal rods in the circumferential locations which are between the rods and radially outward of the line of fusion.
Claim 2
Dependent Claim
153 words
A non-solvent bonded assembly of a rigid thermoplastic well screen formed of helical wire wraps bonded to a series of circumferentially spaced longitudinal rods and at least one end fitting characterized in that the end fitting and well screen have substantially the same outer diameter, while the fitting has a reduced diameter inner sleeve portion which is telescopically received within one end of the well screen and intimately fused thereto, the plane of fusion between said sleeve portion and said well screen being generally conically tapered along the major portion of the region of telescopic overlap, said sleeve portion having a maximum outer diameter which is greater than the minimum inner diameter of the well screen, said assembly having a fused mixture of the plastic of the sleeve portion and the plastic of the longitudinal rods in the circumferential locations which are between the rods and radially outward of the line of fusion.
Claim 3
Dependent Claim
29 words
The assembly of claim 1 wherein the maximum outer diameter of the sleeve portion is at least about 0.030" greater than the minimum inner diameter of the well screen.
Claim 4
Dependent Claim
28 words
The assembly of claim 1 wherein the wall thickness of the sleeve portion at a location underlying the end of the well screen is at least about 0.125".
Claim 5
Dependent Claim
20 words
The assembly of claim 1 wherein the axial length of the region of telescopic overlap is at least about 0.75".
Claim 6
Dependent Claim
17 words
The assembly of claim 1 wherein both the well screen and end fitting are formed of PVC.
References Cited (Backward Citations)
US2933428A
Cited
US3499068A
Cited
US3917497A
Cited
US3883162A
Cited
US4068713A
Cited
US4262744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |