Patent US4932112A successfully refreshed from Google Patents.
US4932112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sieve plate and process for making it
Assignee: Individual
•
Filing: 1989-01-31
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Granted: 1990-06-12
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Expires: 2009-01-31
Abstract
Abstract A process for forming a filter screen including the steps of forming a plurality of parallel linear grooves in a sheet of metal to a depth of about 0.5 to 1 mm, forming inclined openings in the grooves through the remainder of the sheet by means of a laser beam, the openings having a width of about 0.2 to 1 mm, the inclination of all the openings in a groove being the same direction, the inclination of openings in neighboring grooves being in the opposite direction to create zig-zag pattern, and compressing the sheet to flow metal from the sheet into the openings to make the openings more fine, in the range of 0.05-0.1 mm.
Inventors
- 👤 Tim Tikkanen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:53
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/4609; B07B1/4618; B01; B01D; B01D29/00; B01D29/01; B01D29/012; B01D29/03; B01D39/00; B01D39/10; B07B1/469; B23; B23K; B23K26/00; B23K26/36; B23K26/362; B23K26/364; B01D2201/00; B01D2201/18; B01D2201/184; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496; Y10T29/49604
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A process for making a filter screen comprising the steps of: a. forming a plurality of parallel linear grooves in a sheet of metal to a depth of about 0.5 to 1 mm from the opposite surface of the sheet, b. forming inclined openings in the grooves through the remainder of the sheet by means of a laser beam, the openings having a width of about 0.2 to 1 mm, the inclination of all openings in a groove being in the same direction, the inclination of openings in neighboring grooves being in the opposite direction to create a zig-zag pattern, and c. compressing the sheet to flow metal from the sheet into the openings to make the openings more fine, in the range of 0.05 to 0.1 mm.
Claim 2
Dependent Claim
128 words
A process for making a filter screen comprising the steps of: a. forming a plurality of parallel linear grooves in a sheet of metal to a depth of about 0.5 to 1 mm from the opposite surface of the sheet, b. forming inclined openings in the grooves through the remainder of the sheet by means of a laser beam, the openings having a width of about 0.2 to 1 mm, the inclination of all openings in a groove being in the same direction, the inclination of openings in neighboring grooves being in the opposite direction to create a zig-zag pattern, and c. compressing the sheet to flow metal from the sheet into the openings to make the openings more fine, in the range of 0.05 to 0.1 mm.
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) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |