Patent US3694187A successfully refreshed from Google Patents.
US3694187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of carbonyl iron
Assignee: Huntington Alloys Corp
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Filing: 1971-07-02
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Granted: 1972-09-26
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Expires: 1991-07-02
Abstract
Abstract THERMAL DECOMPOSITION OF IRON CARBONYL VAPOUR TO CARBONYL IRON POWDER IS CATALYSED BY CARRING OUT THE DECOMPOSITION IN THE PRESENCE OF NITRIC OXIDE (NO), NITROGEN TRIOXIDE (N2O3) OR NITROGEN PEROXIDE (NO2). THE PRESENCE OF THESE GASES ALSO ENABLES THE CARBON CONTENT OF POWDER OF A GIVEN PARTICLE SIZE TO BE REDUCED.
Inventors
- 👤 David Myers Llewelyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:25
CPC Classifications
C; C22; C22B; C22B5/00; C22B5/02; C22B5/20; B; B22; B22F; B22F9/00; B22F9/16; B22F9/30; B22F9/305; C21; C21B; C21B15/00; C21B15/04; C22B23/00; C22B23/06; C22B23/065
Claims Analysis
Total Claims: 0
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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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |