US4575421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-clogging wear-reducing screen assembly for vibrating screening machine
Assignee: Derrick Manufacturing Corp
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Filing: 1984-03-08
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Granted: 1986-03-11
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Expires: 2004-03-08
Abstract
Abstract A non-clogging and wear-reducing screen assembly for a vibrating screening machine including a substantially rigid plate having upper and lower sides and having first and second pairs of opposite edges, attachment members formed integrally with a plate on a first pair of opposite edges for attachment to a vibrating screening machine, a plurality of spaced openings throughout the substantially rigid plate and extending in both directions between the first and second pairs of the opposite edges, borders on the plate surrounding the openings, a supporting screen on the upper side of the plate, first and second superimposed contiguous abutting screens overlying the supporting screen, and adhesive firmly securing the supporting screen and the first and second screens to the borders of the openings.
Inventors
- 👤 James W. Derrick
- 👤 Robert G. Derrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:07
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/4609; B07B1/4663; B01; B01D; B01D33/00; B01D33/01; B01D33/03; B07B1/469; B07B1/48; B07B1/49; B07B1/50
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
118 words
A screen assembly for a vibrating screening machine comprising a substantially rigid plate having upper and lower sides and having outer edge portions, a plurality of spaced openings in said substantially rigid plate extending in both directions between said outer edge portions, said spaced openings being relatively small as compared to the size of said plate, border portions on said plate surrounding said openings, first and second superimposed screening screens on said upper side and extending across said openings, adhesive means firmly bonding portions of said first and second screening screens surrounding said openings to said border portions, and channel means at opposite sides of said rigid plate for attaching said rigid plate to a vibratory screening machine.
Claim 2
Dependent Claim
118 words
A screen assembly for a vibrating screening machine comprising a substantially rigid plate having upper and lower sides and having outer edge portions, a plurality of spaced openings in said substantially rigid plate extending in both directions between said outer edge portions, said spaced openings being relatively small as compared to the size of said plate, border portions on said plate surrounding said openings, first and second superimposed screening screens on said upper side and extending across said openings, adhesive means firmly bonding portions of said first and second screening screens surrounding said openings to said border portions, and channel means at opposite sides of said rigid plate for attaching said rigid plate to a vibratory screening machine.
Claim 3
Dependent Claim
27 words
A screen assembly for a vibrating screening machine as set forth in claim 1 wherein said channel means comprise channels formed integrally with said substantially rigid plate.
Claim 4
Dependent Claim
50 words
A screen assembly for a vibrating screening machine as set forth in claim 1 wherein said second screening screen is interposed between said first screening screen and said plate, and wherein said second screening screen has openings which are approximately 20% larger than the openings of said first screening screen.
Claim 5
Dependent Claim
58 words
A screen assembly for a vibrating screening machine as set forth in claim 1 wherein said border portions comprise first strip-like members extending generally lengthwise in a first direction and second strip-like members extending generally lengthwise in a second direction transverse to said first direction, said second strip-like members including portions which are staggered relative to each other.
Claim 6
Dependent Claim
23 words
A screen assembly for a vibrating screening machine as set forth in claim 4 wherein said openings are in the form of quadrangles.
Claim 7
Dependent Claim
27 words
A screen assembly for a vibrating screening machine as set forth in claim 4 wherein said channel means comprise channels formed integrally with said substantially rigid plate.
Claim 8
Dependent Claim
31 words
A screen assembly for a vibrating screening machine as set forth in claim 1 wherein said first and second screening screens have a mesh number of between about 80 and 400.
Claim 9
Dependent Claim
20 words
A screen assembly for a vibrating screening machine as set forth in claim 7 wherein said adhesive means is epoxy.
Claim 10
Dependent Claim
50 words
A screen assembly for a vibrating screening machine as set forth in claim 1 including a supporting screen of larger mesh than said first and second screening screens firmly bonded to said border portions on said upper side and located between said upper side and said first and second screens.
Claim 11
Dependent Claim
31 words
A screen assembly for a vibrating screening machine as set forth in claim 9 wherein said first and second screening screens have a mesh size of between about 80 and 400.
Claim 12
Dependent Claim
21 words
A screen assembly for a vibrating screening machine as set forth in claim 9 wherein said adhesive means is epoxy adhesive.
Claim 13
Dependent Claim
50 words
A screen assembly for a vibrating screening machine as set forth in claim 9 wherein said second screening screen is interposed between said first screening screen and said plate and wherein said second screening screen has openings which are approximately 20% larger than the openings of the first screening screen.
Claim 14
Dependent Claim
27 words
A screen assembly for a vibrating screening machine as set forth in claim 4 wherein said channel means comprise channels formed integrally with said substantially rigid plate.
Claim 15
Dependent Claim
58 words
A screen assembly for a vibrating screening machine as set forth in claim 9 wherein said border portions comprise first strip-like members extending generally lengthwise in a first direction and second strip-like members extending generally lengthwise in a second direction transverse to said first direction, said second strip-like members including portions which are staggered relative to each other.
Claim 16
Dependent Claim
23 words
A screen assembly for a vibrating screening machine as set forth in claim 14 wherein said openings are in the form of quadrangles.
Claim 17
Dependent Claim
22 words
A screen assembly for a vibrating screening machine as set forth in claim 15 wherein said openings are approximately one inch square.
Claim 18
Dependent Claim
150 words
A screen assembly for a vibrating screening machine comprising a plate having upper and lower sides and having outer edge portions, a plurality of spaced openings in said plate extending in a plurality of directions within said outer edge portions, said spaced openings being relatively small as compared to the size of said plate, border portions on said plate surrounding said openings, a first screening screen on said upper side extending across said openings, adhesive means firmly bonding portions of said first screening screen surrounding said openings to said border portions, a second screening screen of larger mesh than said first screening screen interposed between said first screening screen and said plate and bonded by said adhesive to said plate on the border portions of said plate surrounding said openings, and channel means at opposite sides of said rigid plate for attaching said rigid plate to a vibratory screening machine.
Claim 19
Dependent Claim
150 words
A screen assembly for a vibrating screening machine comprising a plate having upper and lower sides and having outer edge portions, a plurality of spaced openings in said plate extending in a plurality of directions within said outer edge portions, said spaced openings being relatively small as compared to the size of said plate, border portions on said plate surrounding said openings, a first screening screen on said upper side extending across said openings, adhesive means firmly bonding portions of said first screening screen surrounding said openings to said border portions, a second screening screen of larger mesh than said first screening screen interposed between said first screening screen and said plate and bonded by said adhesive to said plate on the border portions of said plate surrounding said openings, and channel means at opposite sides of said rigid plate for attaching said rigid plate to a vibratory screening machine.
Claim 20
Dependent Claim
27 words
A screen assembly for a vibrating screening machine as set forth in claim 17 including a supporting screen bonded between said second screening screen and said plate.
Claim 21
Dependent Claim
58 words
A screen assembly for a vibrating screening machine as set forth in claim 17 wherein said border portions comprise first strip-like members extending generally lengthwise in a first direction and second strip-like members extending generally lengthwise in a second direction transverse to said first direction, said second strip-like members including portions which are staggered relative to each other.
References Cited (Backward Citations)
US1716758A
Cited
US2061850A
Cited
US2723032A
Cited
US2985303A
Cited
US3900628A
Cited
US4033865A
Cited
US4040951A
Cited
US4380494A
Cited
US4457839A
Cited
US4420391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |