US3005702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of manufacturing porous membranes
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
•
Filing: 1958-09-29
•
Granted: 1961-10-24
•
Expires: 1978-09-29
Abstract
No abstract record available.
Inventors
- 👤 Chandron Georges
- 👤 Caron Michel
- 👤 Cano Georges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:51
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/08; C22C9/00; C22C9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A METHOD OF PREPARING A POROUS MEMBRANE WHICH COMPRISES MAKING A SOLID METAL ALLOY CONTAINING COPPER, ZINC, AT LEAST TWO PENTAVALENT ELEMENTS OF THE GROUP CONSISTING OF PHOSPHORUS, ARSENIC, AND ANTIMONY, AND AS A GRAIN REFINER NICKEL, THE PERCENTAGES OF COPPER AND ZINC IN SAID ALLOY BEING WITHIN THE RANGE CORRESPONDING TO BRASS AND GERMAN SILVER ALLOYS CONTAINING ABOUT 30 TO 40 PERCENT OF ZINC, FORMING THIS ALLOY TO THE SHAPE OF A THIN MEMBRANE, ANNEALING SAID MEMBRANE IN A NEUTRAL ATMOSPHERE, FIRST AT A TEMPERATURE RANGING FROM 200 TO 300*C., THEN AT A TEMPERATURE RANGING FROM 300 TO 500* C., TO CAUSE SAID PENTAVALENT ELEMENTS TO SEGREGATE IN THE JOINTS BETWEEN THE GRAINS OF THE ALLOY, AND SUBSEQUENTLY HEATING SAID MEMBRANE IN A VACUUM TO CAUSE ZINC TO EVAPORATE THEREFROM, SAID PENTAVALENT ELEMENTS ACCELERATING ZINC DIFFUSION AND EVAPORATION.
Claim 2
Independent Claim
139 words
A METHOD OF PREPARING A POROUS MEMBRANE WHICH COMPRISES MAKING A SOLID METAL ALLOY CONTAINING COPPER, ZINC, AT LEAST TWO PENTAVALENT ELEMENTS OF THE GROUP CONSISTING OF PHOSPHORUS, ARSENIC, AND ANTIMONY, AND AS A GRAIN REFINER NICKEL, THE PERCENTAGES OF COPPER AND ZINC IN SAID ALLOY BEING WITHIN THE RANGE CORRESPONDING TO BRASS AND GERMAN SILVER ALLOYS CONTAINING ABOUT 30 TO 40 PERCENT OF ZINC, FORMING THIS ALLOY TO THE SHAPE OF A THIN MEMBRANE, ANNEALING SAID MEMBRANE IN A NEUTRAL ATMOSPHERE, FIRST AT A TEMPERATURE RANGING FROM 200 TO 300*C., THEN AT A TEMPERATURE RANGING FROM 300 TO 500* C., TO CAUSE SAID PENTAVALENT ELEMENTS TO SEGREGATE IN THE JOINTS BETWEEN THE GRAINS OF THE ALLOY, AND SUBSEQUENTLY HEATING SAID MEMBRANE IN A VACUUM TO CAUSE ZINC TO EVAPORATE THEREFROM, SAID PENTAVALENT ELEMENTS ACCELERATING ZINC DIFFUSION AND EVAPORATION.
References Cited (Backward Citations)
US2070101A
Cited
US2157596A
Cited
US2236452A
Cited
US2369813A
Cited
US2307051A
Cited
US2462045A
Cited
US2792302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-23 | 1965-04-24 | 1965-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-23 | 1969-04-24 | 1969-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-23 | 1973-04-24 | 1973-10-24 | $7700.00 | Window Closed / Lapsed |