EP0054828A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Deep well screen
Assignee: Nagaoka Kanaami KK
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Filing: 1981-12-08
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Granted: —
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Expires: 2001-12-08
Abstract
Abstract A screen, particularly a well screen to be used for a deep well, comprises a reinforcing member (2) of generally cylindrical configuration, a plurality of support rods (3) arranged on the outside of said reinforcing member (2) in the axial direction thereof at a predetermined interval and a wire (4) wound helically on the outside of said support rods (3) at predetermined pitch. A multitude of slits (2b) each of which is continuous in substantially the circumferential direction of said reinforcing member (2) being formed at a predetermined pitch in said reinforcing member (2).
Inventors
- 👤 Tadayoshi Nagaoka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 12:11
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: 5
Claim 1
Independent Claim
85 words
A screen characterized by comprising a reinforcing member (2) of substantially cylindrical configuration, a plurality of support rods (3) arranged on the outside of said reinforcing member (2) in the axial direction thereof at a predetermined interval and a wire (4) wound helically on the outside of said support rods (3) at predetermined pitch, a multitude of slits (2b) each of which is continuous in substantially the circumferential direction of said reinforcing member (2) being formed at a predetermined pitch in said reinforcing member (2).
Claim 2
Dependent Claim
85 words
A screen characterized by comprising a reinforcing member (2) of substantially cylindrical configuration, a plurality of support rods (3) arranged on the outside of said reinforcing member (2) in the axial direction thereof at a predetermined interval and a wire (4) wound helically on the outside of said support rods (3) at predetermined pitch, a multitude of slits (2b) each of which is continuous in substantially the circumferential direction of said reinforcing member (2) being formed at a predetermined pitch in said reinforcing member (2).
Claim 3
Dependent Claim
28 words
A screen as defined in claim 1 wherein said reinforcing member (2) consists of a plurality of rings (2a) arranged at an equal interval in the axial direction.
Claim 4
Dependent Claim
19 words
A screen as defined in claim 1 wherein said reinforcing member (2) consists of a helically wound wire (4).
Claim 5
Dependent Claim
21 words
A screen as defined in claim 1 wherein said reinforcing member (2) has a shape adapted for use as a screen.
References Cited (Backward Citations)
US1862838A
Cited
US1950202A
Cited
US1995850A
Cited
US2624411A
Cited
FR1380123A
Cited
US3712373A
Cited
FR2351686A1
Cited
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