US3313622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making porous metal tubes
Assignee: POUDRES METALLIQUES ALLIAGES SPECIAUX UGINE CARBONE
•
Filing: 1964-03-16
•
Granted: 1967-04-11
•
Expires: 1984-03-16
Abstract
No abstract record available.
Inventors
- 👤 Potet Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:00
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/1017; B22F3/1021; B22F3/1025; B22F3/11; B22F3/1121
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
237 words
A METHOD OF MAKING TIN WALLED, METAL TUBES OF HIGH POROSITY, HIGH PERMEABILITY, HIGH MECHANICAL STRENGTH AND HAVING SUBSTANTIALLY UNIFORM SIZED PORES WHICH COMPRISES, (A) MIXING METAL POWDER AND AN EXTRUSION BINDER AT A TEMPERATURE AT WHICH SAID BINDER IS LIQUID TO FORM A PASTE, (1) SAID METAL POWDER BEING IN A TAPPED DENSITY STATE, (2) SAID BINDER BEING VOLATILE AT THE TEMPERATURE OF THE SINTERING TEMPERATURE OF THE POWDER, AND (3) THE AMOUNT OF SAID BINDER WHICH IS MIXED WITH THE METAL POWDER BEING SUBSTANTIALLY EQUAL TO THE VOLUME OF PORES PRESENT IN THE METAL POWDER WHEN IT IS IN THE TAPPED DENSITY STATE, (B) COOLING SAID PASTE TO SUBSTANTIALLY AMBIENT TEMPERATURE, (C) EXTRUDING SAID PASTE TO FORM A TUBE AT SUBSTANTIALLY AMBIENT TEMPERATURE, (D) PLACING SAID TUBE IN A BED OF POWDER INERT TO THE METAL POWDER AND THE BINDER UNDER THE PREVAILING CONDITIONS, AND FILLING SAID TUBE WITH SAID INERT POWDER, SAID INERT POWDER HAVING A SPECIFIC SURFACE SUCH THAT THE INTERNAL PORE SURFACE OF THE GRAINS THEREOF IS SUBSTANTIALLY ABOUT 10 TO 100 TIMES THAT OF THE EXTERNAL SURFACE OF SAID GRAINS, (E) HEATING SAID TUBE AND SAID INERT POWDER TO MELT THE BINDER AND TRANSFER THE BINDER FROM THE TUBE TO THE INERT POWDER BY ABSORPTION, AND (F) FURTHER HEATING SAID TUBE AND SAID INERT POWDER TO SINTER THE METAL POWDER IN THE TUBE AND VOLATILIZE THE BINDER IN SAID INERT POWDER.
Claim 2
Independent Claim
237 words
A METHOD OF MAKING TIN WALLED, METAL TUBES OF HIGH POROSITY, HIGH PERMEABILITY, HIGH MECHANICAL STRENGTH AND HAVING SUBSTANTIALLY UNIFORM SIZED PORES WHICH COMPRISES, (A) MIXING METAL POWDER AND AN EXTRUSION BINDER AT A TEMPERATURE AT WHICH SAID BINDER IS LIQUID TO FORM A PASTE, (1) SAID METAL POWDER BEING IN A TAPPED DENSITY STATE, (2) SAID BINDER BEING VOLATILE AT THE TEMPERATURE OF THE SINTERING TEMPERATURE OF THE POWDER, AND (3) THE AMOUNT OF SAID BINDER WHICH IS MIXED WITH THE METAL POWDER BEING SUBSTANTIALLY EQUAL TO THE VOLUME OF PORES PRESENT IN THE METAL POWDER WHEN IT IS IN THE TAPPED DENSITY STATE, (B) COOLING SAID PASTE TO SUBSTANTIALLY AMBIENT TEMPERATURE, (C) EXTRUDING SAID PASTE TO FORM A TUBE AT SUBSTANTIALLY AMBIENT TEMPERATURE, (D) PLACING SAID TUBE IN A BED OF POWDER INERT TO THE METAL POWDER AND THE BINDER UNDER THE PREVAILING CONDITIONS, AND FILLING SAID TUBE WITH SAID INERT POWDER, SAID INERT POWDER HAVING A SPECIFIC SURFACE SUCH THAT THE INTERNAL PORE SURFACE OF THE GRAINS THEREOF IS SUBSTANTIALLY ABOUT 10 TO 100 TIMES THAT OF THE EXTERNAL SURFACE OF SAID GRAINS, (E) HEATING SAID TUBE AND SAID INERT POWDER TO MELT THE BINDER AND TRANSFER THE BINDER FROM THE TUBE TO THE INERT POWDER BY ABSORPTION, AND (F) FURTHER HEATING SAID TUBE AND SAID INERT POWDER TO SINTER THE METAL POWDER IN THE TUBE AND VOLATILIZE THE BINDER IN SAID INERT POWDER.
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) | 1970-04-10 | 1970-10-10 | 1971-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-10 | 1974-10-10 | 1975-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-10 | 1978-10-10 | 1979-04-11 | $7700.00 | Window Closed / Lapsed |