Patent US3679061A successfully refreshed from Google Patents.
US3679061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded filter leaf
Assignee: Envirotech Corp
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Filing: 1970-06-15
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Granted: 1972-07-25
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Expires: 1990-06-15
Abstract
Abstract A double-faced filter leaf formed from two flat, molded sections joined back-to-back. Drainage channels are formed between parallel ribs molded on the front face of each section. A collecting channel transversely intersecting the drainage channels is also formed on the front face adjacent one edge of the leaf. Conduits for applying vacuum and removing filtrate are provided between the sections by opposed grooves formed on the back faces thereof. The conduits extend the full length of the leaf and are in communication with the drainage channels on the front face through one or more ports. Means are provided to hold a filter medium in place over the ribs.
Inventors
- 👤 Steven S Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:20
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/39
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
139 words
A double-faced filter leaf construction having top, bottom and side edges comprising two solid impervious substantially flat molded sections joined together in back-to-back relationship, a plurality of parallel ribs on each face of said leaf forming drainage channels therebetween, a collection channel formed on each face to transversely intersect said drainage channels, at least one elongated internal vacuum tube formed by a groove in the back surface of at least one of said sections and extending longitudinally thereof between and parallel to said faces, said internal vacuum tube being in communication with said collection channel and extending upward to the top edge of said leaf, and port means in said leaf located substantially near the junction of said collection channel and said vacuum tube, said port means constituting the sole communication between the collection channel and the vacuum tube.
Claim 2
Dependent Claim
139 words
A double-faced filter leaf construction having top, bottom and side edges comprising two solid impervious substantially flat molded sections joined together in back-to-back relationship, a plurality of parallel ribs on each face of said leaf forming drainage channels therebetween, a collection channel formed on each face to transversely intersect said drainage channels, at least one elongated internal vacuum tube formed by a groove in the back surface of at least one of said sections and extending longitudinally thereof between and parallel to said faces, said internal vacuum tube being in communication with said collection channel and extending upward to the top edge of said leaf, and port means in said leaf located substantially near the junction of said collection channel and said vacuum tube, said port means constituting the sole communication between the collection channel and the vacuum tube.
Claim 3
Dependent Claim
48 words
A construction according to preceding claim 1 in which said drainage channels are formed between parallel ribs running longitudinally of said leaf and said collection channel is transverse to said drainage channel and is formed between the ends of said ribs and the bottom edge on said leaf.
Claim 4
Dependent Claim
35 words
A construction according to preceding claim 2 in which said surface channels are concave and said elongated internal vacuum tube is formed by a pair of opposed grooves in the back side of each section.
Claim 5
Dependent Claim
28 words
A construction according to preceding claim 3 in which said sections are molded and said side edges are extended upward to form a means for hanging said leaf.
Claim 6
Dependent Claim
18 words
A construction according to preceding claim 4 in which said impervious sections are symmetrical in shape and design.
Claim 7
Dependent Claim
20 words
A construction according to preceding claim 5 in which a reinforcing member is molded into said side and top edges.
Claim 8
Dependent Claim
21 words
A construction according to preceding claim 6 in which spaced horizontal strips override said parallel ribs running longitudinally of said leaf.
Claim 9
Dependent Claim
17 words
A construction according to claim 6 in which a filter medium overrides the faces of said leaf.
Claim 10
Dependent Claim
26 words
A construction according to claim 1 in which said drainage channels are formed between parallel horizontal ribs and intersect with at least one vertical drainage channel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |