US2819209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous articles of fluoroethylene polymers and process of making the same
Assignee: PALL
•
Filing: 1952-11-15
•
Granted: 1958-01-07
•
Expires: 1972-11-15
Abstract
No abstract record available.
Inventors
- 👤 David B Pall
- 👤 Krakauer Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:26
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/24; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1638; B01D39/1653; B01D39/1661; B01D2239/00; B01D2239/10; C08J2327/00; C08J2327/02; C08J2327/12; Y; Y10; Y10S; Y10S521/00; Y10S521/919
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
54 words
A PROCESS OF PREPARING A FLUID-PERMEABLE FILTER OF FLUOROETHYLENE POLYMER WHICH COMPRISES SINTERING A LAYER OF PARTICLES OF FLUOROETHYLENE POLYMER WHILE CONFINING THE LAYER BETWEEN INERT NON-ADHERING SURFACES UNDER A PRESSURE WITHIN THE RANGE FROM 30-50 P.S.I. AT A TEMPERATURE ABOVE THE SOFTENING TEMPERATURE AND BELOW THE MELTING AND DECOMPOSITION TEMPERATURE OF THE PARTICLES.
Claim 2
Dependent Claim
54 words
A PROCESS OF PREPARING A FLUID-PERMEABLE FILTER OF FLUOROETHYLENE POLYMER WHICH COMPRISES SINTERING A LAYER OF PARTICLES OF FLUOROETHYLENE POLYMER WHILE CONFINING THE LAYER BETWEEN INERT NON-ADHERING SURFACES UNDER A PRESSURE WITHIN THE RANGE FROM 30-50 P.S.I. AT A TEMPERATURE ABOVE THE SOFTENING TEMPERATURE AND BELOW THE MELTING AND DECOMPOSITION TEMPERATURE OF THE PARTICLES.
Claim 3
Dependent Claim
95 words
A FLUID-PERMEABLE MICROPOROUS FLUOROETHYLENE POLYMER FILTER HAVING PORES OF MICROSCOPIC DIMENSIONS COMPRISING A NETWORK IN SHEET FORM OF INTERCONNECTED AGGREGATES OF UNITED FLUOROETHYLENE POLYMER PARTICLES, THE AGGREGATES DEFINING OPEN SPACES INTERCOMMUNICATING THROUGHOUT THE NETWORK TO DEFINE PORES OF MICROSCOPIC DIMENSIONS EXTENDING FROM SURFACE TO SURFACE OF THE SHEET AND UNIFORMLY DISTRIBUTED FROM SURFACE TO SURFACE OF THE SHEET FOR FLOW THRETHROUGH OF THE FILTERED FLUID, THE AGGREGATES THEREBY CONSTITUTING A SHEET UNIFORM IN POROSITY FROM SURFACE TO SURFACE AND HAVING A HIGH TENSILE STRENGTH AND FLOW CAPACITY RELATIVE TO ITS VOID CONTENT AND PORE SIZE.
Claim 4
Dependent Claim
95 words
A FLUID-PERMEABLE MICROPOROUS FLUOROETHYLENE POLYMER FILTER HAVING PORES OF MICROSCOPIC DIMENSIONS COMPRISING A NETWORK IN SHEET FORM OF INTERCONNECTED AGGREGATES OF UNITED FLUOROETHYLENE POLYMER PARTICLES, THE AGGREGATES DEFINING OPEN SPACES INTERCOMMUNICATING THROUGHOUT THE NETWORK TO DEFINE PORES OF MICROSCOPIC DIMENSIONS EXTENDING FROM SURFACE TO SURFACE OF THE SHEET AND UNIFORMLY DISTRIBUTED FROM SURFACE TO SURFACE OF THE SHEET FOR FLOW THRETHROUGH OF THE FILTERED FLUID, THE AGGREGATES THEREBY CONSTITUTING A SHEET UNIFORM IN POROSITY FROM SURFACE TO SURFACE AND HAVING A HIGH TENSILE STRENGTH AND FLOW CAPACITY RELATIVE TO ITS VOID CONTENT AND PORE SIZE.
References Cited (Backward Citations)
US1742411A
Cited
US1815959A
Cited
US2400099A
Cited
US2403476A
Cited
US2400091A
Cited
US2456262A
Cited
US2554343A
Cited
US2573639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |