US2631085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of black oxide of iron
Assignee: Reconstruction Finance Corp
•
Filing: 1947-04-02
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Granted: 1953-03-10
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Expires: 1967-04-02
Abstract
No abstract record available.
Inventors
- 👤 Leonard M Bennetch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:06
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; C01G49/08; C01P; C01P2006/00; C01P2006/60; Y; Y10; Y10S; Y10S423/00; Y10S423/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A PROCESS OF MANUFACTURING BLACK OXIDE OF IRON WHICH COMPRISES HEATING A SLURRY OF FERRIC OXIDE HYDRATE AND FERROUS OXIDE HYDRATE OF PH NOT LESS THAN 7 IN PROPORTIONS BY WEIGHT RESPECTIVELY OF 65 TO 75 PER CENT AND 35 TO 25 PER CENT TO A TEMPERATURE OF ABOUT 200 DEGREES F. AND MAINTAINING SAID TEMPERATURE FOR ABOUT TWO HOURS.
Claim 2
Dependent Claim
60 words
A PROCESS OF MANUFACTURING BLACK OXIDE OF IRON WHICH COMPRISES HEATING A SLURRY OF FERRIC OXIDE HYDRATE AND FERROUS OXIDE HYDRATE OF PH NOT LESS THAN 7 IN PROPORTIONS BY WEIGHT RESPECTIVELY OF 65 TO 75 PER CENT AND 35 TO 25 PER CENT TO A TEMPERATURE OF ABOUT 200 DEGREES F. AND MAINTAINING SAID TEMPERATURE FOR ABOUT TWO HOURS.
References Cited (Backward Citations)
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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) | 1956-03-09 | 1956-09-08 | 1957-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-09 | 1960-09-08 | 1961-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-09 | 1964-09-08 | 1965-03-10 | $7700.00 | Window Closed / Lapsed |