Patent US2633407A successfully refreshed from Google Patents.
US2633407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing red unhydrated iron oxide
Assignee: Mineral Pigments Corp
•
Filing: 1947-08-25
•
Granted: 1953-03-31
•
Expires: 1967-08-25
Abstract
No abstract record available.
Inventors
- 👤 Daniel W Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:54
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; C01G49/06; C01P; C01P2006/00; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
A PROCESS FOR THE PRODUCTION OF RED UNHYDRATED IRON OXIDE PIGMENT WHICH COMPRISERS FORMING A SUSPENSION OF PRECIPITATED FERROUS HYDRATE, ADDING A FERRIC SALT TO THE SUSPENSION THEREBY FORMING A PRECIPITATED IRON HYDRATE IMMERSION MIXTURE CAUSING SAID MIXTURE TO HAVE A PH IN THE ACIDIC RANGE, IMMERSING METALLIC IRON IN THE RESULTING ACIDIC MIXTURE, AND OXIDIZING THE IRON WHILE IMMERSED IN SAID MIXTURE.
References Cited (Backward Citations)
US2127907A
Cited
US1424635A
Cited
US1368748A
Cited
US1840326A
Cited
GB385646A
Cited
US2388659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |