Patent US3208198A successfully refreshed from Google Patents.
US3208198A
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US
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Method for hydrogen diffusion
Assignee: Engelhard Industries Inc
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Filing: 1962-07-26
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Granted: 1965-09-28
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Expires: 1982-07-26
Abstract
No abstract record available.
Inventors
- 👤 Leonard R Rubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:16
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/22; C; C01; C01B; C01B3/00; C01B3/50; C01B3/501; C01B3/503; C01B3/505; H; H01; H01M; H01M4/00; H01M4/86; H01M4/94; C01B2203/00; C01B2203/04; C01B2203/0405; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A METHOD FOR SHUTTING DOWN DIFFUSION APPARATUS WHEREIN HYDROGEN IS SEPARATED FROM A GASEOUS MIXTURE CONTAINING HYDROGEN BY CONTACTING SAID GASEOUS MIXTURE WITH ONE SIDE OF A HYDROGEN-PERMEABLE NOBLE METAL MEMBRANE AT A TEMPERATURE BETWEEN ABOUT 300*C. AND ABOUT 500*C. WHILE MAINTAINING A PRESSURE DIFFERENTIAL BETWEEN THE TWO SIDES OF SAID MEMBRANE WHICH METHOD COMPRISES HEATING SAID MEMBRANE TO AN ELEVATED TEMPERATURE BETWEEN ABOUT 550*C. AND ABOUT 800*C. AND COOLING SAID MEMBRANE IN THE ABSENCE OF HYDROGEN TO A TEMPERATURE BELOW ABOUT 300*C.
Claim 2
Independent Claim
83 words
A METHOD FOR SHUTTING DOWN DIFFUSION APPARATUS WHEREIN HYDROGEN IS SEPARATED FROM A GASEOUS MIXTURE CONTAINING HYDROGEN BY CONTACTING SAID GASEOUS MIXTURE WITH ONE SIDE OF A HYDROGEN-PERMEABLE NOBLE METAL MEMBRANE AT A TEMPERATURE BETWEEN ABOUT 300*C. AND ABOUT 500*C. WHILE MAINTAINING A PRESSURE DIFFERENTIAL BETWEEN THE TWO SIDES OF SAID MEMBRANE WHICH METHOD COMPRISES HEATING SAID MEMBRANE TO AN ELEVATED TEMPERATURE BETWEEN ABOUT 550*C. AND ABOUT 800*C. AND COOLING SAID MEMBRANE IN THE ABSENCE OF HYDROGEN TO A TEMPERATURE BELOW ABOUT 300*C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |