US3971722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter elements
Assignee: Individual
•
Filing: 1975-01-17
•
Granted: 1976-07-27
•
Expires: 1995-01-17
Abstract
Abstract A filter element primarily for disc filters and comprising a pair of moulded panels secured together in parallel relationship so as to define between them a cavity, each panel having on its outer surface a series of outstanding spaced parallel supporting ribs, drainage perforations through the panels between the ribs thereon, and a drainage outlet from the cavity between the panels.
Inventors
- 👤 Colin Michael Radford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:18
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/15; B01D33/21; B01D33/23; B01D29/00; B01D29/39; B01D29/41; B01D29/413
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
62 words
A filter element comprising a pair of moulded panels secured together to define an internal cavity, a plurality of radially spaced, generally laterally extending supporting ribs on the outer surfaces of the panels, a plurality of drainage perforations between each of a plurality of radially adjacent twos of the ribs and communicating with the cavity and a drainage outlet from said cavity.
Claim 2
Dependent Claim
62 words
A filter element comprising a pair of moulded panels secured together to define an internal cavity, a plurality of radially spaced, generally laterally extending supporting ribs on the outer surfaces of the panels, a plurality of drainage perforations between each of a plurality of radially adjacent twos of the ribs and communicating with the cavity and a drainage outlet from said cavity.
Claim 3
Dependent Claim
41 words
A filter element as claimed in claim 1 in which the two panels each have an integral surrounding ridge forming the boundary of the cavity and ridge with the two ridges being secured together to hold the panels in spaced relationship.
Claim 4
Dependent Claim
34 words
A filter element as claimed in claim 2 in which the panels are secured together additionally by means of a plurality of individual, spaced lugs extending inwardly into the cavity without compartmentalizing the cavity.
Claim 5
Dependent Claim
22 words
A filter element as claimed in claim 1 in which the element is a disc filter element of substantially trucated sector shape.
Claim 6
Dependent Claim
46 words
A filter element as claimed in claim 4 in which the outlet from the cavity is located at the narrower end of the element and baffles are located adjacent said outlet so as to be in the path of liquid blown back during a blow-off cycle.
Claim 7
Dependent Claim
18 words
A filter element as claimed in claim 1 in which the panels are injection moulded from plastics material.
Claim 8
Dependent Claim
35 words
A filter element as claimed in claim 1 wherein each rib slopes so that at one respective lateral extreme thereof each rib lies closer to the drainage outlet than at the opposite lateral extreme thereof.
Claim 9
Dependent Claim
57 words
A filter element as claimed in claim 7 wherein filter element is a disk filter element of substantially truncated sector shape with the cavity outlet centrally located at the narrower end of the element and the ribs on each said panel outer surface are arranged in two laterally adjacent sets on such surface in a herringbone pattern.
Claim 10
Dependent Claim
67 words
A filter element as claimed in claim 7 wherein the filter element is a disk filter element of substantially truncated sector shape with the cavity outlet substantially laterally displaced toward one lateral extreme of the narrower end of the element and the ribs on each panel are arranged in a set which slopes radially inward toward said one lateral extreme of the narrower end of the element.
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) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |