Patent US3241681A successfully refreshed from Google Patents.
US3241681A
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Assignee: Pall Corp
•
Filing: 1961-08-31
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Granted: 1966-03-22
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Expires: 1981-08-31
Abstract
No abstract record available.
Inventors
- 👤 David B Pall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:48
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/10; B01D39/12; B01D27/00; B01D27/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496; Y10T29/49604
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A MENDED FILTER ELEMENT COMPRISING A BASE MESH OF INTERWOVEN METALLIC FILAMENTS, SAID FILAMENTS BEING DISPOSED IN FIXED RELATIVE POSITIONS AND SINTEREED AT THEIR POINTS OF JUNCTURE TO DEFINE THEREBETWEEN A SERIES OF PORES, SAID PORES HAVING AN AVERAGE PORE SIZE FROM ABOUT 8 TO ABOUT 50 MICRONS, CERTAIN OF SAID FILAMENTS IN SAID BASE MESH DEFINING THEREBETWEEN OVERSIZED PORES OF UP TO TEN TIMES SAID AVERAGE PORE SIZE, SAID OVERSIZED PORES BEING RANDOMLY SPACED WITHIN SAID BASE MESH, METALLIC PARTICLES DEPOSITED ON SAID CERTAIN FILAMENTS AND SINTER-BONDED TO EACH OTHER AND TO SAID CERTAIN FILAMENTS IN AN AMOUNT SUFFICIENT TO REDUCE THE SIZE OF SAID OVERSIZED PORES TO SUBSTANTIALLY THE AVERAGE PORE SIZE, SAID METALLIC PARTICLES EACH HAVING A MAXIMUM SIZE LESS THAN HALF THE SIZE OF THE LARGEST OF SAID OVERSIZED PORES, THE FILAMENTS DEFINING THE PORES OF AVERAGE PORE SIZE BEING RELATIVELY FREE FROM METALLIC PARTICLES WHICH APPRECIABLY REDUCE THE AVERAGE PORE SIZE.
Claim 2
Dependent Claim
156 words
A MENDED FILTER ELEMENT COMPRISING A BASE MESH OF INTERWOVEN METALLIC FILAMENTS, SAID FILAMENTS BEING DISPOSED IN FIXED RELATIVE POSITIONS AND SINTEREED AT THEIR POINTS OF JUNCTURE TO DEFINE THEREBETWEEN A SERIES OF PORES, SAID PORES HAVING AN AVERAGE PORE SIZE FROM ABOUT 8 TO ABOUT 50 MICRONS, CERTAIN OF SAID FILAMENTS IN SAID BASE MESH DEFINING THEREBETWEEN OVERSIZED PORES OF UP TO TEN TIMES SAID AVERAGE PORE SIZE, SAID OVERSIZED PORES BEING RANDOMLY SPACED WITHIN SAID BASE MESH, METALLIC PARTICLES DEPOSITED ON SAID CERTAIN FILAMENTS AND SINTER-BONDED TO EACH OTHER AND TO SAID CERTAIN FILAMENTS IN AN AMOUNT SUFFICIENT TO REDUCE THE SIZE OF SAID OVERSIZED PORES TO SUBSTANTIALLY THE AVERAGE PORE SIZE, SAID METALLIC PARTICLES EACH HAVING A MAXIMUM SIZE LESS THAN HALF THE SIZE OF THE LARGEST OF SAID OVERSIZED PORES, THE FILAMENTS DEFINING THE PORES OF AVERAGE PORE SIZE BEING RELATIVELY FREE FROM METALLIC PARTICLES WHICH APPRECIABLY REDUCE THE AVERAGE PORE SIZE.
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) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |