Patent US3890125A successfully refreshed from Google Patents.
US3890125A
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Filter bag
Assignee: Standard Oil Co
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Filing: 1974-04-01
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Granted: 1975-06-17
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Expires: 1994-04-01
Abstract
Abstract A filter bag of thermoplastic material for filtering solids from gases has a longitudinal joint formed by fusing together overlapping edge portions of the material so as to form a tubular body. In an apparatus for forming the filter bag, a heating element which is shaped like a blade heats the thermoplastic material to at least the softening point and a pair of opposing rollers are adapted to compress the heated material so as to form the fused seam.
Inventors
- 👤 Vincent E Schoeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:32
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/20; B01; B01D; B01D46/00; B01D46/02; B29C53/00; B29C53/36; B29C53/38; B29C53/48; B29C66/00; B29C66/01; B29C66/03; B29C66/032; B29C66/0324; B29C66/03241; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/14; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/70; B29C66/72; B29C66/727; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/82; B29C66/822; B29C66/8221; B29C66/8223; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413; B29C66/71; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0854; B29L; B29L2023/00; B29L2023/005; B29L2031/00; B29L2031/14; B29L2031/712; B29L2031/7128
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
A FILTER BAG FOR FILTERING SOLIDS FROM GASES, SAID FILTER BAG COMPRISING A SHEET OF FABRIC OF POROUS THERMOPLASTIC MATERIAL HAVING OPPOSITE EDGE PORTIONS OF SAID FABRIC OVERLAPPED AND JOINED TOGETHER IN A FUSED JOINT AND DEFINING A TUBULAR BODY, SAID JOINT EXTENDING LONGITUDINALLY ALONG SAID TUBULAR BODY, AND SAID JOINT HAVING ESSENTIALLY THE SAME THICKNESS AS THAT OF SAID SHEET OF FABRIC.
Claim 2
Dependent Claim
63 words
A FILTER BAG FOR FILTERING SOLIDS FROM GASES, SAID FILTER BAG COMPRISING A SHEET OF FABRIC OF POROUS THERMOPLASTIC MATERIAL HAVING OPPOSITE EDGE PORTIONS OF SAID FABRIC OVERLAPPED AND JOINED TOGETHER IN A FUSED JOINT AND DEFINING A TUBULAR BODY, SAID JOINT EXTENDING LONGITUDINALLY ALONG SAID TUBULAR BODY, AND SAID JOINT HAVING ESSENTIALLY THE SAME THICKNESS AS THAT OF SAID SHEET OF FABRIC.
Claim 3
Dependent Claim
28 words
A filter bag according to claim 1 wherein said thermoplastic material is selected from the group consisting of polyamide fibers, polyester fibers, olefin polymer fibers and mixtures thereof.
Claim 4
Dependent Claim
18 words
A filter bag according to claim 1 wherein said fused joint is less than 1/2 inch in width.
Claim 5
Dependent Claim
19 words
A filter bag according to claim 3 wherein said joint has a width between 1/8 inch and 1/2 inch.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |