Patent US4427626A successfully refreshed from Google Patents.
US4427626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making products from powders of tool steels
Assignee: Individual
•
Filing: 1980-02-13
•
Granted: 1984-01-24
•
Expires: 2000-02-13
Abstract
Abstract The method of the invention relates to powder metallurgy and is intended to be used for making cutting tools, dies as well as vital structural members. The method comprises charging a powder into a capsule, sealing the capsule, heating and then extruding the capsule containing the powder. The sealed capsule is heated up to a temperature of 700° to 1000° C., whereupon the capsule is depressurized and heated up to a temperature of 1050° to 1200° C.
Inventors
- 👤 Alexei K. Petrov
- 👤 Vladimir B. Akimenko
- 👤 Vladimir N. Zhuchin
- 👤 Alexei G. Tsipunov
- 👤 Elena N. Smirnova
- 👤 Jury N. Skornyakov
- 👤 Alexandr F. Klimenko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:27
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; B; B22; B22F; B22F3/00; B22F3/12; B22F3/1208; B22F3/20; B22F3/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
76 words
A method of making products from powders of tool steels, comprising charging a powder into a capsule, sealing the capsule, heating and then extruding the capsule with the powder contained therein, wherein the heating of said sealed capsule is carried out in two steps wherein said sealed capsule is first heated up to a temperature of 700° to 1000° C., whereupon it is then depressurized and heated up to a temperature of 1050° to 1200° C.
Claim 2
Independent Claim
76 words
A method of making products from powders of tool steels, comprising charging a powder into a capsule, sealing the capsule, heating and then extruding the capsule with the powder contained therein, wherein the heating of said sealed capsule is carried out in two steps wherein said sealed capsule is first heated up to a temperature of 700° to 1000° C., whereupon it is then depressurized and heated up to a temperature of 1050° to 1200° C.
Claim 3
Dependent Claim
29 words
A method as claimed in claim 1, wherein the capsule containing the powder is filled with nitrogen at a pressure of 1 to 5·10 5 Pa prior to sealing.
References Cited (Backward Citations)
US3411902A
Cited
US3936299A
Cited
SU417246A1
Cited
SU418271A1
Cited
US3893852A
Cited
US3997341A
Cited
US4069042A
Cited
US4106931A
Cited
US4225344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |