US4637877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter disc
Assignee: PTI Technologies Inc
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Filing: 1985-09-03
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Granted: 1987-01-20
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Expires: 2005-09-03
Abstract
Abstract A disc-shaped stainless steel filter element including filter media formed from air-laid randomly disposed sintered fibers secured to a hub. The filter media includes opposed sheets of the fibers having perforated plate means therebetween to allow flow from the outside in. The plate means and the fiber sheets are welded together at the outer periphery thereof and the fiber sheets are welded at their inner periphery to the hub.
Inventors
- 👤 Wilhelm U. Hartmann
- 👤 James A. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:23
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D29/41
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
disc-shaped stainless steel filter element for filtering fluid flowing from outside to inside thereof and including filter media of randomly disposed stainless steel sintered fibers comprising: a solid stainless steel hub including a body defining a central opening therethrough and having first and second spaced apart surfaces, a radially extending peripheral flange, a plurality of radial passageways extending through said body including said flange; first and second layers of sintered stainless steel ramdomly disposed fiber filter media disposed over said flange and extending radially outwardly from the periphery of said first and second spaced apart surfaces respectively; and a stainless steel spacer means disposed between said media layers, said layers and said spacer means being continuously fusion welded together about the outer periphery thereof, said layers of said media being continuously fusion welded to said flange at said first and second surfaces.
Claim 2
Dependent Claim
142 words
disc-shaped stainless steel filter element for filtering fluid flowing from outside to inside thereof and including filter media of randomly disposed stainless steel sintered fibers comprising: a solid stainless steel hub including a body defining a central opening therethrough and having first and second spaced apart surfaces, a radially extending peripheral flange, a plurality of radial passageways extending through said body including said flange; first and second layers of sintered stainless steel ramdomly disposed fiber filter media disposed over said flange and extending radially outwardly from the periphery of said first and second spaced apart surfaces respectively; and a stainless steel spacer means disposed between said media layers, said layers and said spacer means being continuously fusion welded together about the outer periphery thereof, said layers of said media being continuously fusion welded to said flange at said first and second surfaces.
Claim 3
Dependent Claim
31 words
A filter element as defined in claim 1 wherein said media is secured to said body by fusion welding where no material other than said hub and said media are used.
Claim 4
Dependent Claim
32 words
A filter element as defined in claim 2 wherein said body further includes an integral continuous bead extending from each said face adjacent said flange for providing material for said fusion weld.
Claim 5
Dependent Claim
24 words
A filter element as defined in claim 3 wherein said spacer means included first and second perforarated plates having a wire mesh sandwiched therebetween.
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) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |