Patent US3661566A successfully refreshed from Google Patents.
US3661566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the treatment of nodular cast iron
Assignee: Pechiney SA
•
Filing: 1969-09-30
•
Granted: 1972-05-09
•
Expires: 1989-09-30
Abstract
Abstract A process for the treatment of molten iron to produce castings having a graphite nodular structure in which the molten cast iron is first treated with a nodulating alloy containing magnesium and boron and then with an inoculating alloy containing silicon and barium.
Inventors
- 👤 Jean-Claude G Percheron
- 👤 Louis Septier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:40
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/10; E; E04; E04B; E04B7/00; E04B7/12; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
29 words
A process as claimed in claim 1 in which the nodulating alloy contains magnesium and boron in the ratio of weight percentages within the range of 15 to 30.
Claim 2
Dependent Claim
29 words
A process as claimed in claim 1 in which the inoculating alloy contains silicon and barium in the ratio of weight percentages within the range of 4 to 12.
Claim 3
Dependent Claim
52 words
A process as claimed in claim 1 in which the nodulating alloy contains magnesium and boron in the ratio in weight percentage within the range of 15 to 30 and in which the inoculating alloy contains silicon and barium in the ratio of weight percentage within the range of 4 to 12.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |