US3329276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid filter elements
Assignee: Purolator Technologies Inc
•
Filing: 1966-08-10
•
Granted: 1967-07-04
•
Expires: 1986-08-10
Abstract
No abstract record available.
Inventors
- 👤 Herman C Mouwen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:35
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
AN OUTSIDE-IN FILTER ELEMENT FOR USE UNDER HIGH DIFFERENTIAL PRESSURES, INCLUDING WIRE MESH FABRIC WOVEN FROM FINE-GAUGED METAL WIRES AND HAVING A SUBSTANTIALLY UNIFORM PORE SIZE OF 25 MICRONS OR LESS PERMITTING THE USE OF BUBBLE TESTING TO SHOW THE ABSOLUTE PORE SIZE OF THIS FABRIC, THE LATTER BEING IN THE FORM OF A SIMPLE STRAIGHTWALLED CYLINDER FREE FROM PLEATS AND OTHER IRREGULAR SHAPES IN THE SURFACE OF THE CYLINDER AND THROUGH WHICH THE FLUID TO BE FILTERED FLOWS INWARDLY, MEANS FOR INTERNALLY SUPPORTING SAID CYLINDER AGAINST INWARD DEFORMATION THEREOF DUE TO THE PRESSURE OF SAID FLUID WHILE PERMITTING THE FLUID FLOW INWARDLY THERETHROUGH, A WALL OF FILTERING MATERIAL HAVING A NON-UNIFORM PORE SIZE TO A DEGREE PREVENTING IT FROM BEING BUBBLE TESTED TO DETERMINE ITS ABSOLUTE PORE SIZE WITH CERTAINTY, SAID WALL SURROUNDING THE OUTSIDE OF SAID
Claim 2
Dependent Claim
138 words
AN OUTSIDE-IN FILTER ELEMENT FOR USE UNDER HIGH DIFFERENTIAL PRESSURES, INCLUDING WIRE MESH FABRIC WOVEN FROM FINE-GAUGED METAL WIRES AND HAVING A SUBSTANTIALLY UNIFORM PORE SIZE OF 25 MICRONS OR LESS PERMITTING THE USE OF BUBBLE TESTING TO SHOW THE ABSOLUTE PORE SIZE OF THIS FABRIC, THE LATTER BEING IN THE FORM OF A SIMPLE STRAIGHTWALLED CYLINDER FREE FROM PLEATS AND OTHER IRREGULAR SHAPES IN THE SURFACE OF THE CYLINDER AND THROUGH WHICH THE FLUID TO BE FILTERED FLOWS INWARDLY, MEANS FOR INTERNALLY SUPPORTING SAID CYLINDER AGAINST INWARD DEFORMATION THEREOF DUE TO THE PRESSURE OF SAID FLUID WHILE PERMITTING THE FLUID FLOW INWARDLY THERETHROUGH, A WALL OF FILTERING MATERIAL HAVING A NON-UNIFORM PORE SIZE TO A DEGREE PREVENTING IT FROM BEING BUBBLE TESTED TO DETERMINE ITS ABSOLUTE PORE SIZE WITH CERTAINTY, SAID WALL SURROUNDING THE OUTSIDE OF SAID
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-03 | 1971-01-02 | 1971-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-03 | 1975-01-02 | 1975-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-03 | 1979-01-02 | 1979-07-04 | $7700.00 | Window Closed / Lapsed |