Patent US4003756A successfully refreshed from Google Patents.
Patent US4186100A successfully refreshed from Google Patents.
US4186100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inertial filter of the porous metal type
Assignee: Individual
•
Filing: 1978-04-17
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Granted: 1980-01-29
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Expires: 1998-04-17
Abstract
Abstract A porous filter is formed of sintered metal particles and is characterized by having sintered metal particles of relatively large size throughout and a thin subsurface area adjacent the upstream surface containing sintered metal particles of relatively small size, thus providing a thin area of relatively small pore size adjacent the upstream surface while the remaining major portion of the filter has a relatively large pore size. The filter is particularly useful as an inertial filter and as a support for reverse osmosis membranes.
Inventors
- 👤 Lambert H. Mott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:21
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0039; B01D67/0041; B01D67/00411; B01D29/00; B01D29/11; B01D29/111; B01D29/31; B01D39/00; B01D39/14; B01D39/20; B01D39/2027; B01D39/2031; B01D39/2034; B01D61/00; B01D61/14; B01D61/145; B01D61/18; B01D63/00; B01D63/06; B01D67/0046; B01D69/00; B01D69/04; B01D69/10; B01D69/108; B01D71/00; B01D71/02; B01D71/022; B01D71/0223; B01D71/02232; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F3/1103; B22F3/1109; B22F3/114; B22F7/00; B22F7/002; B01D2325/00; B01D2325/04; B22F2999/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
An inertial type filter element comprising a porous wall composed of sintered metal particles in the size range of 0.5 to 44 microns and having a subsurface section not exceeding about 0.015 inches in thickness adjacent its upstream surface having a smaller pore size formed by finer metal particles in the size range of 0.02 to 0.5 microns which are deposited and sintered therein.
Claim 2
Dependent Claim
64 words
An inertial type filter element comprising a porous wall composed of sintered metal particles in the size range of 0.5 to 44 microns and having a subsurface section not exceeding about 0.015 inches in thickness adjacent its upstream surface having a smaller pore size formed by finer metal particles in the size range of 0.02 to 0.5 microns which are deposited and sintered therein.
Claim 3
Dependent Claim
29 words
A filter element as defined in claim 1 wherein the filter element wall is in the form of a cylindrical tube and the upstream surface is its inner surface.
Claim 4
Dependent Claim
36 words
A filter element as defined in claim 2 wherein the cylindrical tube is formed as an outer tube having an inner lining and wherein the inner lining has a smaller pore size than the outer tube.
Claim 5
Dependent Claim
24 words
A filter element as defined in claim 2 wherein the cylindrical tube has an inner diameter within the range of 1/16 to 5/8 inch.
Claim 6
Dependent Claim
18 words
A filter element as defined in claim 2 wherein the inner surface is covered with a semi-permeable membrane.
Claim 7
Dependent Claim
17 words
A filter element as defined in claim 5 wherein the semi-permeable membrane is a coating of plastic.
Claim 8
Dependent Claim
20 words
A filter element as defined in claim 1 wherein all of the metal particles are formed of corrosion resistant metal.
Claim 9
Dependent Claim
24 words
A filter element as defined in claim 1 wherein the thickness of the porous wall is in the range of 0.01 to 0.5 inches.
Claim 10
Dependent Claim
28 words
A filter element as defined in claim 8 wherein the filter element is in the form of a cylindrical tube and the upstream surface is its inner surface.
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) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |