Patent US3684447A successfully refreshed from Google Patents.
US3684447A
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US
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Producing hydrogen by contact of steam with iron oxide promoted with zinc ferrite
Assignee: Phillips Petroleum Co
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Filing: 1970-10-06
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Granted: 1972-08-15
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Expires: 1990-10-06
Abstract
Abstract ZINC FERRITE IS INCORPORATED WITH IRON OXIDE AND USED TO PRODUCE HYDROGEN FROM STEAM IN THE STEAM-IRON PROCESS.
Inventors
- 👤 Harlin D Johnston
- 👤 Roy C Fury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:14
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/06; C01B3/061; C01B3/08; C01B3/10; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |