US2938781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of magnetic iron particles
Assignee: GAF Chemicals Corp
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Filing: 1957-12-27
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Granted: 1960-05-31
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Expires: 1977-12-27
Abstract
No abstract record available.
Inventors
- 👤 Schmeckenbecher Arnol Fredrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:00
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/30; B22F9/305; C; C21; C21B; C21B15/00; C21B15/04; C22; C22B; C22B5/00; C22B5/02; C22B5/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A PROCESS FOR PRODUCING FINELY DIVIDED IRON PARTICLES COMPRISING CONTINUOUSLY FORMING A GASEOUS MIXTURE CONTAINING IRON CARBONYL VAPORS AND AN INERT GAS IN VOLUMETRIC PROPORTIONS OF ABOUT 1:410, AT A TEMPERATURE BELOW THE DECOMPOSITION TEMPERATURE THEREOF, AND PASSING SAID MIXTURE THROUGH A THERMAL DECOMPOSITION ZONE HEATED TO A TEMPERATURE OF ABOUT 200 TO 800* C.
Claim 2
Dependent Claim
55 words
A PROCESS FOR PRODUCING FINELY DIVIDED IRON PARTICLES COMPRISING CONTINUOUSLY FORMING A GASEOUS MIXTURE CONTAINING IRON CARBONYL VAPORS AND AN INERT GAS IN VOLUMETRIC PROPORTIONS OF ABOUT 1:410, AT A TEMPERATURE BELOW THE DECOMPOSITION TEMPERATURE THEREOF, AND PASSING SAID MIXTURE THROUGH A THERMAL DECOMPOSITION ZONE HEATED TO A TEMPERATURE OF ABOUT 200 TO 800* C.
References Cited (Backward Citations)
BE498769A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |