US2631085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of black oxide of iron
Assignee: Reconstruction Finance Corp
•
Filing: 1947-04-02
•
Granted: 1953-03-10
•
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 11:04
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)
US2127907A
Cited
GB190123859A
Cited
US802928A
Cited
US1327061A
Cited
US1368748A
Cited
US2133267A
Cited
US2388659A
Cited
US2419240A
Cited
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 |