Patent CH290406A successfully refreshed from Google Patents.
Patent US3941703A successfully refreshed from Google Patents.
US3941703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wire screens
Assignee: TRISLOT SYSTEMS NV ROTERIJSTRAAT 134-136 WAREGEM BELGIUM A CORP OF BELGIUM
•
Filing: 1974-12-02
•
Granted: 1976-03-02
•
Expires: 1994-12-02
Abstract
Abstract A process for producing metal wire screens having extremely narrow slot widths. The process comprises compressing along the longitudinal axes of the supporting wires a wire screen having parallel narrowly spaced screening wires supported by parallel supporting wires and wherein the average spacing of the screening wires is larger than desired. The compression effects plastic deformation of the supporting wires whereby the desired average slot width is formed.
Inventors
- 👤 Edouard Binard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:37
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/4609; B07B1/4618; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496; Y10T29/49604
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
94 words
A wire screen having substantially parallel screening wires separated by slots of a desired average slot width less than 25 microns, said screen produced by compressing, along the longitudinal axes of the supporting wires, a wire screen comprising substantially parallel screen wires supported by supporting wires and wherein the screening wires are separated by slots having an average slot width greater than desired, the compression effecting plastic deformation of the supporting wires to narrow the slot width of the screening wires to thereby form the said wire screen having the desired average slot width.
Claim 2
Dependent Claim
94 words
A wire screen having substantially parallel screening wires separated by slots of a desired average slot width less than 25 microns, said screen produced by compressing, along the longitudinal axes of the supporting wires, a wire screen comprising substantially parallel screen wires supported by supporting wires and wherein the screening wires are separated by slots having an average slot width greater than desired, the compression effecting plastic deformation of the supporting wires to narrow the slot width of the screening wires to thereby form the said wire screen having the desired average slot width.
Claim 3
Dependent Claim
95 words
A process for producing wire screens having substantially parallel screening wires separated by slots of a desired average slot width less than 25 microns, the process comprising compressing, along the longitudinal axes of the supporting wires, a wire screen comprising substantially parallel screening wires supported by supporting wires and wherein the screening wires are separated by slots having an average slot width greater than desired, the compression effecting plastic deformation of the supporting wires to narrow the slot width of the screening wires to thereby form a wire screen having the desired average slot width.
Claim 4
Dependent Claim
95 words
A process for producing wire screens having substantially parallel screening wires separated by slots of a desired average slot width less than 25 microns, the process comprising compressing, along the longitudinal axes of the supporting wires, a wire screen comprising substantially parallel screening wires supported by supporting wires and wherein the screening wires are separated by slots having an average slot width greater than desired, the compression effecting plastic deformation of the supporting wires to narrow the slot width of the screening wires to thereby form a wire screen having the desired average slot width.
Claim 5
Dependent Claim
72 words
A process for producing wire screens of the type referred to having a desired average slot width which is less than 25 μm which comprises compressing along the longitudinal axes of the supporting wires a wire screen of the type referred to having a larger than desired average slot width whereby plastic deformation of the supporting wires is effected and a wire screen having the desired average slot width is thereby formed.
Claim 6
Dependent Claim
72 words
A process for producing wire screens of the type referred to having a desired average slot width which is less than 25 μm which comprises compressing along the longitudinal axes of the supporting wires a wire screen of the type referred to having a larger than desired average slot width whereby plastic deformation of the supporting wires is effected and a wire screen having the desired average slot width is thereby formed.
Claim 7
Dependent Claim
23 words
A process as claimed in claim 3 wherein the screen prior to compression has an average slot width of at least 25 μm.
Claim 8
Dependent Claim
20 words
A process as claimed in claim 3 wherein the screening wires and/or the supporting wires have an essentially triangular cross-section.
Claim 9
Dependent Claim
21 words
A process as claimed in claim 5 wherein the screening wires and/or the supporting wires have an essentially isosceles triangular cross-section.
Claim 10
Dependent Claim
50 words
A process as claimed in claim 6 wherein the ratio of the length of the unequal side of the said cross-section to the perpendicular distance from said unequal side to the apex formed by the two equal sides of the said cross-section is in the range of 0.3:1 to 0.9:1.
Claim 11
Dependent Claim
23 words
A process as claimed in claim 6 wherein the length of the unequal side of the said cross-section is 2mm to 500 μm.
Claim 12
Dependent Claim
15 words
A process as claimed in claim 5 wherein the said triangular cross-section has rounded apexes.
Claim 13
Dependent Claim
21 words
A process as claimed in claim 3 wherein the screening wires and the supporting wires have essentially the same cross-sectional shape.
Claim 14
Dependent Claim
30 words
A process as claimed in claim 3 wherein the ratio of the cross-sectional area of the supporting wires to the cross-sectional area of the screening wires is less than 4:1.
Claim 15
Dependent Claim
21 words
A process as claimed in claim 11 wherein the screening wires and the supporting wires have essentially the same cross-sectional area.
Claim 16
Dependent Claim
30 words
A process as claimed in claim 3 wherein the distance between adjacent supporting wires is from 5 to 25 times the width of the screening surface of individual screening wires.
Claim 17
Dependent Claim
23 words
A process as claimed in claim 3 wherein the wire screens formed have a slot width of from 10 μm to 20 μm.
Claim 18
Dependent Claim
21 words
A process as claimed in claim 14 wherein the wire screens formed have an average slot width of about 15 μm.
Claim 19
Dependent Claim
23 words
A process as claimed in claim 3 wherein the wire screens formed have a slot width of from 5 μm to 15 μm.
Claim 20
Dependent Claim
21 words
A process as claimed in claim 16 wherein the wire screens formed have an average slot width of about 10 μm.
Claim 21
Dependent Claim
23 words
A process as claimed in claim 3 wherein the wire screens formed have a slot width of from 1 μm to 10 μm.
Claim 22
Dependent Claim
21 words
A process as claimed in claim 18 wherein the wire screens formed have an average slot width of about 5 μm.
Claim 23
Dependent Claim
34 words
A process as claimed in claim 3 wherein the reduction in length effected by plastic deformation of the wire screen amounts to 1 to 4% measured along the longitudinal axes of the supporting wires.
Claim 24
Dependent Claim
29 words
A process as claimed in claim 3 wherein the supporting wires are composed of a material which is at least as ductile as the material of the screening wires.
Claim 25
Dependent Claim
24 words
A process as claimed in claim 3 wherein the supporting wires are composed of annealed stainless steel and the screening wires of stainless steel.
Claim 26
Dependent Claim
20 words
A process as claimed in claim 3 wherein the supporting wires and the screening wires are composed of Titan alloy.
Claim 27
Dependent Claim
20 words
A process as claimed in claim 3 wherein the supporting wires and the screening wires are composed of Monel alloy.
Claim 28
Dependent Claim
24 words
A process as claimed in claim 3 wherein the supporting wires are composed of annealed Hastelloy alloy and the screening wires of Hastelloy alloy.
Claim 29
Dependent Claim
40 words
A process as claimed in claim 3 wherein the wire screen is supported in a framework of retaining members during the compression of the screen, whereby the formation of kinks in the supporting wires and screening wires is substantially avoided.
Claim 30
Dependent Claim
21 words
A process as claimed in claim 3 wherein the compression is effected while the wire screen is at an elevated temperature.
Claim 31
Dependent Claim
59 words
A process as claimed in claim 3 for the preparation of cylindrical wire screens which comprises compressing a cylindrical wire screen formed from a spiral of screening wire and a plurality of supporting wires disposed parallel to the longitudinal axis of the spiral of screening wire, the wire screen being compressed along the longitudinal axes of the supporting wires.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |