US2994600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron powder for making sintered iron articles
Assignee: Individual
•
Filing: 1959-08-14
•
Granted: 1961-08-01
•
Expires: 1979-08-14
Abstract
No abstract record available.
Inventors
- 👤 Hansen Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:05
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
IN A PROCESS OF PRODUCING SINTERED IRON ARTICLES, THE STEPS OF FORMING A MASS OF SUBSTANTIALLY PURE IRON POWDER OF SUITABLE CHARACTER FOR SINTERING, CONTACTING A PORTION THEREOF CONSTITUTING ABOUT 6-35% BY WEIGHT OF THE MASS WITH NITROGEN AT A TEMPERATURE OF ABOUT 300-450*C. TO SOFT NITRIDE THE PORTION, AND ADMIXING THE SOFT NITRIDED PORTION WITH THE REMAINDER OF THE MASS.
Claim 2
Dependent Claim
61 words
IN A PROCESS OF PRODUCING SINTERED IRON ARTICLES, THE STEPS OF FORMING A MASS OF SUBSTANTIALLY PURE IRON POWDER OF SUITABLE CHARACTER FOR SINTERING, CONTACTING A PORTION THEREOF CONSTITUTING ABOUT 6-35% BY WEIGHT OF THE MASS WITH NITROGEN AT A TEMPERATURE OF ABOUT 300-450*C. TO SOFT NITRIDE THE PORTION, AND ADMIXING THE SOFT NITRIDED PORTION WITH THE REMAINDER OF THE MASS.
References Cited (Backward Citations)
US2284638A
Cited
US2812276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |