US3279615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid filter elements
Assignee: Vokes Ltd
•
Filing: 1963-10-08
•
Granted: 1966-10-18
•
Expires: 1983-10-08
Abstract
No abstract record available.
Inventors
- 👤 Edward A Stokes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:24
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A FILTER COMPRISING A COAXIAL PAIR OF INNER AND OUTER FORAMINOUS METAL CYLINDERS DISPOSED ONE WITHIN THE OTHER, A SHEET OF FILTER MATERIAL HAVING DEEP PLEATS FORMED BY FOLDING AND BENT INTO A CYLINDER DISPOSED BETWEEN SAID PAIR OF METAL CYLINDERS WITH THE FOLD LINES PARALLEL TO THE COMMON AXIS OF AND ALONG THE METAL CYLINDERS, A PLURALITY OF STIFFENER STRIPS DISPOSED PARALLEL TO THE FOLD LINES OF SAID PLEATS AND HAVING CORRUGATIONS TRANSVERSE TO THE PLEAT FOLDS, ONE STIFFENER STRIP BEING BOUNDED TO AN EXTERIOR FACE OF EACH PLEAT AND ANOTHER STIFFENER STRIP BEING BOUNDED TO AN INTERIOR FACE OF THE SAME PLEAT AND BOTH SERVING TO SPACE THE PLEATS, AND A PAIR OF DISHED ANNULAR CAPS SECURED TO THE ENDS OF BOTH OF THE METAL CYLINDERS TO ENCLOSE THE SPACE THEREBETWEEN.
Claim 2
Dependent Claim
133 words
A FILTER COMPRISING A COAXIAL PAIR OF INNER AND OUTER FORAMINOUS METAL CYLINDERS DISPOSED ONE WITHIN THE OTHER, A SHEET OF FILTER MATERIAL HAVING DEEP PLEATS FORMED BY FOLDING AND BENT INTO A CYLINDER DISPOSED BETWEEN SAID PAIR OF METAL CYLINDERS WITH THE FOLD LINES PARALLEL TO THE COMMON AXIS OF AND ALONG THE METAL CYLINDERS, A PLURALITY OF STIFFENER STRIPS DISPOSED PARALLEL TO THE FOLD LINES OF SAID PLEATS AND HAVING CORRUGATIONS TRANSVERSE TO THE PLEAT FOLDS, ONE STIFFENER STRIP BEING BOUNDED TO AN EXTERIOR FACE OF EACH PLEAT AND ANOTHER STIFFENER STRIP BEING BOUNDED TO AN INTERIOR FACE OF THE SAME PLEAT AND BOTH SERVING TO SPACE THE PLEATS, AND A PAIR OF DISHED ANNULAR CAPS SECURED TO THE ENDS OF BOTH OF THE METAL CYLINDERS TO ENCLOSE THE SPACE THEREBETWEEN.
References Cited (Backward Citations)
US1893048A
Cited
US1965172A
Cited
FR923425A
Cited
US2784802A
Cited
US2884091A
Cited
US3096281A
Cited
US2952333A
Cited
US3070937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |