US3888765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precision or micro sieve structure
Assignee: Veco Zeefplatenfabriek BV
•
Filing: 1973-05-17
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Granted: 1975-06-10
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Expires: 1993-05-17
Abstract
Abstract A precision micro sieve structure consists of a thin flexible metal sieve surface mounted between two annular bodies axially aligned with each other and connected together. An annular portion of the sieve surface contacts a bordering shoulder which is perpendicular to the axis of rotation of the annular bodies and is clamped therebetween while being made taut by an annular groove on one bordering shoulder and an annular land on the other bordering shoulder axially aligned with the annular groove. The opening of the groove is greater than the sum of the width of the land and twice the thickness of the sieve, while the depth of the groove is greater than the sum of the height of the land and the thickness of the sieve.
Inventors
- 👤 Fredrik Willem Bolk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:41
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/02; G01N15/0272; B; B01; B01D; B01D29/00; B01D29/01; B01D29/012; B01D29/96; B01D35/00; B01D35/28; B07; B07B; B07B1/00; B07B1/46; B07B1/48
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
A precision micro structure comprising two annular bodies axially aligned with each other and connected together, a flexible sieve surface mounted therebetween, an annular portion of the sieve surface being in contact with a bordering shoulder on each of the annular bodies, each bordering shoulder being substantially perpendicular to the axis of rotation of the annular bodies, the improvement comprising an annular groove on one bordering shoulder, an annular land on the other bordering shoulder axially aligned with the annular groove and adapted to fit therein, the opening of the groove being greater than the sum of the width of the land and twice the thickness of the sieve, and the depth of the groove being greater than the sum of the height of the land and the thickness of the sieve, whereby the annular portion of the sieve surface is clamped between the bordering shoulders of the annular bodies except in the region of the land and groove.
Claim 2
Dependent Claim
159 words
A precision micro structure comprising two annular bodies axially aligned with each other and connected together, a flexible sieve surface mounted therebetween, an annular portion of the sieve surface being in contact with a bordering shoulder on each of the annular bodies, each bordering shoulder being substantially perpendicular to the axis of rotation of the annular bodies, the improvement comprising an annular groove on one bordering shoulder, an annular land on the other bordering shoulder axially aligned with the annular groove and adapted to fit therein, the opening of the groove being greater than the sum of the width of the land and twice the thickness of the sieve, and the depth of the groove being greater than the sum of the height of the land and the thickness of the sieve, whereby the annular portion of the sieve surface is clamped between the bordering shoulders of the annular bodies except in the region of the land and groove.
Claim 3
Dependent Claim
56 words
A sieve structure according to claim 1 wherein the portion of one of said bordering shoulders radially within the annular land or groove is angularly displaced with respect to the sieve surface such that its radial inner edge will first contact the sieve surface and then deflect into a position parallel to the other bordering shoulder.
Claim 4
Dependent Claim
59 words
A sieve structure according to claim 1 wherein a first of the annular bodies has a groove in the outer periphery of the body positioned axially remote from the bordering shoulder and the second of the annular bodies has a thin edge extending axially from its outer periphery coaxially over said first annular body and inwardly into said groove.
Claim 5
Dependent Claim
28 words
A sieve structure according to claim 1 wherein the peripheral portion of the sieve surface clamped between the bordering shoulders of the annular bodies is without sieve openings.
Claim 6
Dependent Claim
35 words
A sieve structure according to claim 1 further comprising a thin, flat ring positioned in contact with the peripheral portion of the sieve surface which is clamped between the bordering shoulders of the annular bodies.
References Cited (Backward Citations)
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US1138741A
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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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |