Patent US3800943A successfully refreshed from Google Patents.
US3800943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stackable sieve
Assignee: Individual
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Filing: 1972-02-22
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Granted: 1974-04-02
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Expires: 1992-02-22
Abstract
Abstract A sieve for use primarily in particle size analysis is made of a rigid plastic material. The sieve consists of a plastic frame injection molded in two parts with a screen mesh placed therebetween. The edge of one of the frame members is softened and the screen material is bonded thereto. The frame members are then bonded together with the screen therebetween either by use of an epoxy compound or by means of conventional electro-sonic welding. Silicone rubber can be applied at the point where the screening material meets the plastic frame to insure against screen shearing at the junction points.
Inventors
- 👤 L Riesbeck
- 👤 W Blackwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:24
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
In combination, a first sieve and a similar sieve adapted to be stacked with said first sieve for separating materials, said first sieve comprising, a first annular plastic frame member having an annular flange and downwardly directed side portion, a second annular plastic frame member having an annular flange and an upstanding side portion for receiving material to be separated, said upstanding side portion being of a size to snugly surround the downwardly directed side portion of a first frame member of said similar sieve, the annular flange of said first frame member and the annular flange of said second frame member extending radially outward beyond said upstanding side portion and downwardly directed side portion to present means to grip said first sieve for removing said first sieve from said similar sieve and for presenting opposed mating faces, and a screen cloth positioned between and attached to said mating faces.
Claim 2
Dependent Claim
150 words
In combination, a first sieve and a similar sieve adapted to be stacked with said first sieve for separating materials, said first sieve comprising, a first annular plastic frame member having an annular flange and downwardly directed side portion, a second annular plastic frame member having an annular flange and an upstanding side portion for receiving material to be separated, said upstanding side portion being of a size to snugly surround the downwardly directed side portion of a first frame member of said similar sieve, the annular flange of said first frame member and the annular flange of said second frame member extending radially outward beyond said upstanding side portion and downwardly directed side portion to present means to grip said first sieve for removing said first sieve from said similar sieve and for presenting opposed mating faces, and a screen cloth positioned between and attached to said mating faces.
Claim 3
Dependent Claim
58 words
A sieve according to claim 1, wherein said screen cloth is attached to said mating faces by an adhesive and at least one of said mating faces includes means in the form of at least one annular groove therein for receiving some of said adhesive to deeply bond said screen cloth to said one of said mating faces.
Claim 4
Dependent Claim
13 words
A sieve according to claim 2, wherein said adhesive is an epoxy compound.
Claim 5
Dependent Claim
19 words
A sieve according to claim 3, wherein said epoxy compound has an epoxide equivalent in the range of 175-210.
Claim 6
Dependent Claim
196 words
A sieve adapted to be stacked with a like sieve for separating materials comprising, a first annular plastic frame member having an annular flange and downwardly directed side portion, a second annular plastic frame member having an annular flange and an upstanding side portion for receiving material to be separated, said upstanding side portion being of a size to snugly surround the downwardly directed side portion of a first frame member of the like sieve, the annular flange of said first frame member and the annular flange of said second frame member extending radially outward beyond said upstanding side portion and downwardly directed side portion to present means to grip the sieve for removing the sieve from the like sieve and for presenting opposed mating faces, a screen cloth positioned between and attached to said mating faces, one of said mating faces extending radially inwardly of said upstanding side portion to form a corner above the end of said downwardly directed side portion, and a silicone rubber material on the radially inward extension of said upstanding side portion and at the inner periphery of the junction between said downwardly directed side portion and said screen cloth.
Claim 7
Dependent Claim
196 words
A sieve adapted to be stacked with a like sieve for separating materials comprising, a first annular plastic frame member having an annular flange and downwardly directed side portion, a second annular plastic frame member having an annular flange and an upstanding side portion for receiving material to be separated, said upstanding side portion being of a size to snugly surround the downwardly directed side portion of a first frame member of the like sieve, the annular flange of said first frame member and the annular flange of said second frame member extending radially outward beyond said upstanding side portion and downwardly directed side portion to present means to grip the sieve for removing the sieve from the like sieve and for presenting opposed mating faces, a screen cloth positioned between and attached to said mating faces, one of said mating faces extending radially inwardly of said upstanding side portion to form a corner above the end of said downwardly directed side portion, and a silicone rubber material on the radially inward extension of said upstanding side portion and at the inner periphery of the junction between said downwardly directed side portion and said screen cloth.
Claim 8
Dependent Claim
23 words
A sieve according to claim 5, wherein at least one of said first and second frame members has supporting ribs spaced circumferentially thereon.
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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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |