Patent US2666724A successfully refreshed from Google Patents.
US2666724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing iron powder of improved electromagnetic properties
Assignee: GAF Chemicals Corp
•
Filing: 1952-12-03
•
Granted: 1954-01-19
•
Expires: 1972-12-03
Abstract
No abstract record available.
Inventors
- 👤 Beller Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:35
CPC Classifications
B; B22; B22F; B22F1/00; B22F1/14; B22F1/142
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
THE PROCESS OF IMPROVING THE ELECTROMAGNETIC PROPERTIES OF CARBONYL IRON POWDERS WHICH COMPRISES HEATING PULVERULENT IRON OBTAINED BY THE THERMAL DECOMPOSITION OF IRON PENTACARBONYL AT A TEMPERATURE RANGING FROM 450* TO 500* C. IN THE PRESENCE OF AMMONIA GAS FOR A PERIOD OF TIME RANGING FROM 4 TO 10 HOURS, AND COOLING THE HEATED POWDER WITH DRY NITROGEN.
Claim 2
Dependent Claim
58 words
THE PROCESS OF IMPROVING THE ELECTROMAGNETIC PROPERTIES OF CARBONYL IRON POWDERS WHICH COMPRISES HEATING PULVERULENT IRON OBTAINED BY THE THERMAL DECOMPOSITION OF IRON PENTACARBONYL AT A TEMPERATURE RANGING FROM 450* TO 500* C. IN THE PRESENCE OF AMMONIA GAS FOR A PERIOD OF TIME RANGING FROM 4 TO 10 HOURS, AND COOLING THE HEATED POWDER WITH DRY NITROGEN.
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) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |