Patent US704306A successfully refreshed from Google Patents.
Patent US4448686A successfully refreshed from Google Patents.
US4448686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter bag with integral agitator
Assignee: Oil Process Systems Inc
•
Filing: 1982-11-04
•
Granted: 1984-05-15
•
Expires: 2002-11-04
Abstract
Abstract A filter bag is provided with an integral flap for agitating a liquid which is being filtered to thereby inhibit particulate matter from collecting on the filter bag and clogging it during a filtering operation.
Inventors
- 👤 Bernard Friedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:58
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/23; B01D29/27; A; A47; A47J; A47J37/00; A47J37/12; A47J37/1223; B01D29/62; B01D29/70; B01D29/72; B01D29/96; B01D33/00; B01D33/01; B01D33/03; B01D33/0307; B01D33/033; B01D33/80; B01D33/803
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
A filter bag, comprising a porous flexible body having a closed end and an open end, agitating means positioned within said filter bag and formed integrally therewith for agitating liquid being filtered by said filter bag, and attaching means for attaching said agitating means directly to said closed end of said filter bag such that the movement of said agitating means causes a corresponding movement of said closed end of said filter bag body, whereby said agitating means inhibits particular matter collected within said filter bag during a filtering operation from clogging said filter bag.
Claim 2
Dependent Claim
95 words
A filter bag, comprising a porous flexible body having a closed end and an open end, agitating means positioned within said filter bag and formed integrally therewith for agitating liquid being filtered by said filter bag, and attaching means for attaching said agitating means directly to said closed end of said filter bag such that the movement of said agitating means causes a corresponding movement of said closed end of said filter bag body, whereby said agitating means inhibits particular matter collected within said filter bag during a filtering operation from clogging said filter bag.
Claim 3
Dependent Claim
15 words
A filter bag according to claim 1, wherein said agitating means is a flexible flap.
Claim 4
Dependent Claim
12 words
A filter bag according to claim 2, wherein said flap is non-porous.
Claim 5
Dependent Claim
25 words
A filter bag according to claim 2, wherein said flap is manually movable towards and away from said open end of said filter bag body.
Claim 6
Dependent Claim
25 words
A filter bag according to claim 2, wherein said flap is automatically movable towards and away from said open end of said filter bag body.
Claim 7
Dependent Claim
17 words
A filter bag according to claim 2, wherein at least a portion of said flap is porous.
Claim 8
Dependent Claim
12 words
A filter bag according to claim 2, wherein said flap is perforated.
Claim 9
Dependent Claim
43 words
A filter bag according to claim 1, wherein said agitating means including a stiffener attached directly to said closed end of said filter bag and moving means for moving said stiffener towards and away from said open end of said filter bag body.
Claim 10
Dependent Claim
14 words
A filter bag according to claim 8, wherein said moving means is a string.
Claim 11
Dependent Claim
14 words
A filter bag according to claim 1, wherein said agitating means is a string.
Claim 12
Dependent Claim
21 words
A filter bag according to claim 1, wherein said filter bag is adapted for use in a gravity flow filtering system.
Claim 13
Dependent Claim
20 words
A filter bag according to claim 1, wherein said filter bag is adapted for use in a pressurized filtering system.
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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |