US4089783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter
Assignee: ZF International UK Ltd
•
Filing: 1977-02-22
•
Granted: 1978-05-16
•
Expires: 1997-02-22
Abstract
Abstract A multi-layer filter material assembly. The assembly includes a filter medium which consists of a single sheet formed of fibers of a glass having a low coefficient of thermal expansion. The filter medium is supported on each side by at least one sheet of bonded synthetic fibers and a sheet of metallic wire mesh. The two sheets of metallic wire mesh form the two outermost layers and the entire assembly is formed into a pleated configuration.
Inventors
- 👤 Kenneth Holyoak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:27
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D29/50; B01D29/56; B01D29/58; B01D39/08; B01D39/086; B01D2201/00; B01D2201/04; B01D2201/0407; B01D2239/00; B01D2239/06; B01D2239/065; B01D2239/0681; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24686
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
A multi-layer filter material assembly comprising; a filter medium which consists solely of a single delicate sheet formed of fibers of a glass, the fibers being formed in a layer and bonded together and capable of filtering particles on the order of 1.10 microns, said filter medium being supported on each side by at least one support sheet of a bonded synthetic fiber fabric and a sheet of metallic wire mesh, the two sheets of metallic wire mesh thus provided forming respectively the two outer most layers, the whole assembly adapted to be formed into a pleated configuration with the fiber fabric and mesh layers providing support for both sides of the glass fiber sheet, the glass sheet forming the only filtering medium in the assembly, and the support sheet avoiding crushing or disintegration of the delicate glass sheet.
Claim 2
Dependent Claim
139 words
A multi-layer filter material assembly comprising; a filter medium which consists solely of a single delicate sheet formed of fibers of a glass, the fibers being formed in a layer and bonded together and capable of filtering particles on the order of 1.10 microns, said filter medium being supported on each side by at least one support sheet of a bonded synthetic fiber fabric and a sheet of metallic wire mesh, the two sheets of metallic wire mesh thus provided forming respectively the two outer most layers, the whole assembly adapted to be formed into a pleated configuration with the fiber fabric and mesh layers providing support for both sides of the glass fiber sheet, the glass sheet forming the only filtering medium in the assembly, and the support sheet avoiding crushing or disintegration of the delicate glass sheet.
Claim 3
Dependent Claim
22 words
The invention in accordance with claim 1 wherein the sheet formed of fibers of glass has a low coefficient of thermal expansion.
Claim 4
Dependent Claim
19 words
The invention in accordance with claim 1 wherein the sheet of fibers of glass is formed of borosilicate glass.
Claim 5
Dependent Claim
21 words
The invention in accordance with claim 1 wherein each of said sheets of metallic wire mesh is formed from alluminum wire.
Claim 6
Dependent Claim
25 words
The invention in accordance with claim 1 wherein two sheets of bonded fiber fabric are provided on the inner side of said glass fiber sheet.
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) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |