US3192598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a filter element
Assignee: Novo Industrial Corp
•
Filing: 1961-01-03
•
Granted: 1965-07-06
•
Expires: 1981-01-03
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Stevenson
- 👤 Wilfred W Lowther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:41
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A METHOD OF MAKING A DIMENSIONALLY STABLE FILTER, INCLUDING THE STEPS OF FREELY DROPPING FIBERS IN AN INITIAL LAYER ON ONE SIDE OF A SCREEN MESH WHICH WILL TAKE A PERMANENT SET, SAID FIBERS LAYING SUBSTANTIALLY FLAT AND BEING DISPOSED SUBSTANTIALLY PARALLEL TO THE MESH, NEEDLING THE FIBERS OF THE LAYER TO THE SCREEN MESH SO AS TO INTERLOCK THE LAYERS AND MESH, INVERTING THE THUS INTERLOCKED LAYER AND MESH SO THAT THE MESH WILL BE ON TOP AND THE INITIAL LAYER ON THE BOTTOM, FREELY DROPPING A SECOND LAYER OF FIBERS ON THE OTHER SIDE OF THE MESH, THE FIBERS OF THE SECOND LAYER LAYING SUBSTANTIALLY FLAT AND BEING DISPOSED SUBSTANTIALLY PARALLEL TO THE MESH, AND THEREAFTER NEEDLING THE FIBERS OF THE SECOND LAYER TO THE MESH AND INTO THE INITIAL LAYER TO INTERLOCK BOTH LAYERS TO THE SCREEN MESH.
Claim 2
Independent Claim
141 words
A METHOD OF MAKING A DIMENSIONALLY STABLE FILTER, INCLUDING THE STEPS OF FREELY DROPPING FIBERS IN AN INITIAL LAYER ON ONE SIDE OF A SCREEN MESH WHICH WILL TAKE A PERMANENT SET, SAID FIBERS LAYING SUBSTANTIALLY FLAT AND BEING DISPOSED SUBSTANTIALLY PARALLEL TO THE MESH, NEEDLING THE FIBERS OF THE LAYER TO THE SCREEN MESH SO AS TO INTERLOCK THE LAYERS AND MESH, INVERTING THE THUS INTERLOCKED LAYER AND MESH SO THAT THE MESH WILL BE ON TOP AND THE INITIAL LAYER ON THE BOTTOM, FREELY DROPPING A SECOND LAYER OF FIBERS ON THE OTHER SIDE OF THE MESH, THE FIBERS OF THE SECOND LAYER LAYING SUBSTANTIALLY FLAT AND BEING DISPOSED SUBSTANTIALLY PARALLEL TO THE MESH, AND THEREAFTER NEEDLING THE FIBERS OF THE SECOND LAYER TO THE MESH AND INTO THE INITIAL LAYER TO INTERLOCK BOTH LAYERS TO THE SCREEN MESH.
References Cited (Backward Citations)
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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) | 1968-07-05 | 1969-01-04 | 1969-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-05 | 1973-01-04 | 1973-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-05 | 1977-01-04 | 1977-07-06 | $7700.00 | Window Closed / Lapsed |