US4545833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a filter bag assembly
Assignee: Individual
•
Filing: 1984-03-08
•
Granted: 1985-10-08
•
Expires: 2004-03-08
Abstract
Abstract A filter bag assembly includes a filter media fabricated from synthetic materials, has a heat sealed edge forming a cylinder, with one end of the cylinder being heat sealed (welded) to form a closed container. The other cylinder end is folded over a relatively rigid ring member and is sewn (stitched) in a manner to affix the ring member to the filter media thereby maintaining the integrity of the media's micron rating.
Inventors
- 👤 Peter T. Tafara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:11
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C66/82; B29C66/824; B29C66/8242; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/23; B01D29/27; B29C65/00; B29C65/02; B29C65/18; B29C65/22; B29C65/221; B29C65/222; B29C65/224; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/20; B29C66/24; B29C66/244; B29C66/2442; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/432; B29C66/4322; B29C66/90; B29C66/94; B29C66/944; B29C2793/00; B29C2793/0081; B29C66/49; B29C66/70; B29C66/71; B29C66/72; B29C66/729; B29C66/7294; B29C66/91; B29C66/912; B29C66/9121; B29C66/91231; B29K; B29K2023/00; B29K2023/10; B29K2023/12; B29K2027/00; B29K2027/12; B29K2067/00; B29K2077/00; B29L; B29L2031/00; B29L2031/14; B29L2031/712; B29L2031/7128; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036; Y10T156/1038
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
195 words
A method for fabricating a filter bag comprising the steps of: (a) preparing filter media in an elongated, generally rectangular configuration; (b) folding said media in half along its longitudinal axis; (c) placing the juxtaposed edges of said media over a resistance wire disposed in a heater bar; (d) closing said pressure bar upon said heater bar with said media disposed therebetween with a prescribed amount of pressure; (e) applying electrical current to said resistance wire for a prescribed period of time; (f) opening said pressure bar after termination of said electrical current and a prescribed low temperature limit is reached; (g) removing said media from said heater bar; (h) inserting one distal end of said media between said pressure bar and said heater bar with a prescribed amount of pressure; (i) applying electrical current to said resistance wire for a prescribed period of time; (j) opening said pressure bar after termination of said electrical current and said prescribed low temperature limit is reached; (k) placing the open distal end of said media over a relatively rigid ring means; and (l) sewing said media so as to capture said ring means thereto forming a container.
Claim 2
Independent Claim
195 words
A method for fabricating a filter bag comprising the steps of: (a) preparing filter media in an elongated, generally rectangular configuration; (b) folding said media in half along its longitudinal axis; (c) placing the juxtaposed edges of said media over a resistance wire disposed in a heater bar; (d) closing said pressure bar upon said heater bar with said media disposed therebetween with a prescribed amount of pressure; (e) applying electrical current to said resistance wire for a prescribed period of time; (f) opening said pressure bar after termination of said electrical current and a prescribed low temperature limit is reached; (g) removing said media from said heater bar; (h) inserting one distal end of said media between said pressure bar and said heater bar with a prescribed amount of pressure; (i) applying electrical current to said resistance wire for a prescribed period of time; (j) opening said pressure bar after termination of said electrical current and said prescribed low temperature limit is reached; (k) placing the open distal end of said media over a relatively rigid ring means; and (l) sewing said media so as to capture said ring means thereto forming a container.
Claim 3
Dependent Claim
28 words
A method according to claim 1, wherein said media is fabricated from synthetic fibers taken from the group of woven and non-woven polypropylenes, polyesters, fiberglasses, fluorocarbons and polyamides.
Claim 4
Dependent Claim
18 words
A method according to claim 1, wherein the prescribed amount of pressure is between 70 and 120 psi.
Claim 5
Dependent Claim
28 words
A method according to claim 1, wherein application of said electrical current causes said resistance wire to reach a peak temperature of between 400 and 1000 degrees F.
Claim 6
Dependent Claim
17 words
A method according to claim 1, wherein said low temperature is between 150 and 350 degrees F.
Claim 7
Dependent Claim
22 words
A method according to claim 1, wherein said electrical current is applied to said resistance wire from between 5 and 75 seconds.
Claim 8
Dependent Claim
13 words
A method according to claim 3, wherein said pressure is approximately 90 psi.
Claim 9
Dependent Claim
15 words
A method according to claim 4, wherein said peak temperature is approximately 450 degrees F.
Claim 10
Dependent Claim
15 words
A method according to claim 5, wherein said low temperature is approximately 250 degrees F.
Claim 11
Dependent Claim
26 words
A method according to claim 5, further including the step (m) of applying a momentary electric current to said resistance wire to release the media therefrom.
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) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |