US3822744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Straining tube for pipe well
Assignee: Individual
•
Filing: 1972-09-18
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Granted: 1974-07-09
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Expires: 1992-09-18
Abstract
Abstract Straining tube for a pipe well, consisting of separate rings mutually joined by means of rods and which are separated by spacers disposed between them, located at a distance from each other and the cross section of which has the shape of a wedge tapering in the direction towards the interior of the tube. On the surface of the rings there are grooves for facilitating the entrance of water into the straining tube.
Inventors
- 👤 V Reijonen
- 👤 Y Reijonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:17
CPC Classifications
E; E03; E03B; E03B3/00; E03B3/06; E03B3/08; E03B3/16; E03B3/18; E03B3/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
Improvement in a straining tube for a pipe well, comprising an annular straining section extending in the axial direction of the straining tube, said straining section comprising a plurality of separate rings, rods extending through said rings and securing them to the remainder of the straining tube, spacers mounted between said rings and encircling said rods for spacing said rings apart, said rings having a wedge-shaped radial cross section with the radially extending surfaces of said rings diverging toward the radially outer surface of said rings, wherein the improvement comprises that the surface of said rings are provided with a plurality of grooves and each said groove comprises a groove section located on the radially outer circumferential surface of said rings and extending in parallel relationship with the axis of said rings, and at least one other groove section extending radially inwardly from the groove section on the radially outer circumferential surfaces and located in one of the tapering upper and lower surfaces of said rings.
Claim 2
Dependent Claim
166 words
Improvement in a straining tube for a pipe well, comprising an annular straining section extending in the axial direction of the straining tube, said straining section comprising a plurality of separate rings, rods extending through said rings and securing them to the remainder of the straining tube, spacers mounted between said rings and encircling said rods for spacing said rings apart, said rings having a wedge-shaped radial cross section with the radially extending surfaces of said rings diverging toward the radially outer surface of said rings, wherein the improvement comprises that the surface of said rings are provided with a plurality of grooves and each said groove comprises a groove section located on the radially outer circumferential surface of said rings and extending in parallel relationship with the axis of said rings, and at least one other groove section extending radially inwardly from the groove section on the radially outer circumferential surfaces and located in one of the tapering upper and lower surfaces of said rings.
Claim 3
Dependent Claim
63 words
Straining tube for a pipe well according to claim 1, characterized in that the groove sections are located in each of the upper and lower tapering surfaces of said rings and the groove sections in the upper and lower surfaces extend radially inwardly from the radially outer circumferential surface of said rings for a dimension shorter than the radial width of said rings.
Claim 4
Dependent Claim
23 words
Straining tube for a pipe well according to claim 1, characterized in that the depth of the grooves is greater than their width.
Claim 5
Dependent Claim
27 words
Straining tube for a pipe well according to claim 1, characterized in that the width of the grooves is on the order of 0.1 to 1.0 mm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |