US4657079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screen
Assignee: Nagaoka Kanaami KK
•
Filing: 1985-03-07
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Granted: 1987-04-14
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Expires: 2005-03-07
Abstract
Abstract A screen particularly suitable for use in deep well comprises a reinforcing member (2) of a generally cylindrical configuration, a plurality of support rods (3) arranged on the outside of the reinforcing member (2) in the axial direction thereof and a wire (4) wound helically on the outside of the support rods (3). A multitude of slits (2b) continuous in substantially the circumferential direction of the reinforcing member (2) are formed at a predetermined pitch in the reinforcing member (2). The screen made according to the invention has a much larger opening space and therefore has a greater fluid collecting efficiency than conventional screens while maintaining a sufficient strength against an external pressure.
Inventors
- 👤 Tadayoshi Nagaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:36
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/08; E21B43/088; B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/44; B01D29/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A screen for use in environments in which a large external pressure is applied to the screen such as a deep well comprising: a plurality of support rods arranged substantially cylindrically at a predetermined interval in the circumferential direction of the screen: a wire wound helically on the outside of said support rods at a predetermined pitch to perform a screening function; and a reinforcing member of substantially cylindrical configuration made of a plurality of rings arranged on the inside of said support rods at an equal interval in the axial direction, said rings having a cross section such that their length in the radial direction is larger than their length in the axial direction; said wire and said reinforcing member being rigidly fixed to said support rods respectively by welding.
Claim 2
Dependent Claim
131 words
A screen for use in environments in which a large external pressure is applied to the screen such as a deep well comprising: a plurality of support rods arranged substantially cylindrically at a predetermined interval in the circumferential direction of the screen: a wire wound helically on the outside of said support rods at a predetermined pitch to perform a screening function; and a reinforcing member of substantially cylindrical configuration made of a plurality of rings arranged on the inside of said support rods at an equal interval in the axial direction, said rings having a cross section such that their length in the radial direction is larger than their length in the axial direction; said wire and said reinforcing member being rigidly fixed to said support rods respectively by welding.
Claim 3
Dependent Claim
24 words
A screen as defined in claim 1 wherein said reinforcing member has a shape adapted for use as a screening element of the screen.
Claim 4
Dependent Claim
16 words
A screen as defined in claim 2 wherein said reinforcing member has a triangular cross section.
Claim 5
Dependent Claim
132 words
A screen for use in environments in which a large external pressure is applied to the screen such as a deep well comprising: a plurality of support rods arranged substantially cylindrically at a predetermined interval in the circumferential direction of the screen; a wire wound helically on the outside of said support rods at a predetermined pitch to perform a screening function; and a reinforcing member of a substantially cylindrical configuration made of a helical wire with a predetermined pitch arranged on the inside of said support rods, said wire having a cross section such that its length in the radial direction is larger than its cross sectional length in the axial direction of the screen; said wire and said reinforcing member being ridgidly fixed to said support rods respectively by welding.
Claim 6
Dependent Claim
132 words
A screen for use in environments in which a large external pressure is applied to the screen such as a deep well comprising: a plurality of support rods arranged substantially cylindrically at a predetermined interval in the circumferential direction of the screen; a wire wound helically on the outside of said support rods at a predetermined pitch to perform a screening function; and a reinforcing member of a substantially cylindrical configuration made of a helical wire with a predetermined pitch arranged on the inside of said support rods, said wire having a cross section such that its length in the radial direction is larger than its cross sectional length in the axial direction of the screen; said wire and said reinforcing member being ridgidly fixed to said support rods respectively by welding.
Claim 7
Dependent Claim
24 words
A screen as defined in claim 4 wherein said reinforcing member has a shape adapted for use as a screening element of the screen.
Claim 8
Dependent Claim
16 words
A screen as defined in claim 3 wherein said reinforcing member has a triangular cross section.
References Cited (Backward Citations)
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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) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |