US2720937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter construction
Assignee: Cambridge Filter Corp
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Filing: 1952-03-22
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Granted: 1955-10-18
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Expires: 1972-03-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Samuel L Root
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:11
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/522; B01D46/0084; B01D46/0097; B01D46/10; B01D46/523
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
IN FILTER CONSTRUCTION ADAPTED TO FILTER SOLID AND LIQUID PARTICLES FROM GASES AND VAPORS, THE COMBINATION OF FRAME WORK FORMING A PASSAGE FOR GASEOUS OR VAPOR MEDIUM, FILTER MATERIAL ARRANGED IN PLEAT FORMATION ACROSS THE PASSAGE TO FILTER SAID GASEOUS OR VAPOR MEDIUM PASSING THROUGH THE PASSAGE, CORRUGATED SPACING MEMBERS SEPARATING THE PLEATS OF SAID MATERIAL, THE CORRUGATIONS OF EACH MEMBER FORMING CHANNELS THROUGH WHICH MEDIUM FLOWS CONTIGUOUS TO THE PLEATS OF THE FILTER MATERIAL, AT LEAST A WALL OF EACH CHANNEL BEING FORMED BY THE FILTER MATERIAL, SAID CORRUGATIONS TAPERING IN HEIGHT FROM ONE END OF THE SPACING MEMBER TO SUBSTANTIALLY ITS OPPOSITE END TO FORM TAPERED INLET AND OUTLET CHANNELS, SAID INLET CHANNELS DECREASING IN DIMENSIONS IN THE DIRECTION OF FLOW OF MEDIUM AND SAID OUTLET CHANNELS INCREASING IN DIMENSIONS IN THE DIRECTION OF FLOW OF MEDIUM WHEREBY VELOCITY OF MEDIUM ENTERING EACH CHANNEL IS DECREASED, DECREASING TURBULENCE OF MEDIUM WITHIN THE CHANNEL AND INCREASING STATIC PRESSURE WITHIN THE CHANNEL TO DECREASE RESISTANCE TO PASSAGE OF MEDIUM THROUGH THE FILTER CONSTRUCTION.
Claim 2
Dependent Claim
173 words
IN FILTER CONSTRUCTION ADAPTED TO FILTER SOLID AND LIQUID PARTICLES FROM GASES AND VAPORS, THE COMBINATION OF FRAME WORK FORMING A PASSAGE FOR GASEOUS OR VAPOR MEDIUM, FILTER MATERIAL ARRANGED IN PLEAT FORMATION ACROSS THE PASSAGE TO FILTER SAID GASEOUS OR VAPOR MEDIUM PASSING THROUGH THE PASSAGE, CORRUGATED SPACING MEMBERS SEPARATING THE PLEATS OF SAID MATERIAL, THE CORRUGATIONS OF EACH MEMBER FORMING CHANNELS THROUGH WHICH MEDIUM FLOWS CONTIGUOUS TO THE PLEATS OF THE FILTER MATERIAL, AT LEAST A WALL OF EACH CHANNEL BEING FORMED BY THE FILTER MATERIAL, SAID CORRUGATIONS TAPERING IN HEIGHT FROM ONE END OF THE SPACING MEMBER TO SUBSTANTIALLY ITS OPPOSITE END TO FORM TAPERED INLET AND OUTLET CHANNELS, SAID INLET CHANNELS DECREASING IN DIMENSIONS IN THE DIRECTION OF FLOW OF MEDIUM AND SAID OUTLET CHANNELS INCREASING IN DIMENSIONS IN THE DIRECTION OF FLOW OF MEDIUM WHEREBY VELOCITY OF MEDIUM ENTERING EACH CHANNEL IS DECREASED, DECREASING TURBULENCE OF MEDIUM WITHIN THE CHANNEL AND INCREASING STATIC PRESSURE WITHIN THE CHANNEL TO DECREASE RESISTANCE TO PASSAGE OF MEDIUM THROUGH THE FILTER CONSTRUCTION.
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) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |