US2939796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered hard alloys
Assignee: Stora Enso Oyj
•
Filing: 1958-02-11
•
Granted: 1960-06-07
•
Expires: 1978-02-11
Abstract
No abstract record available.
Inventors
- 👤 Wolff Hans Hermann
- 👤 Pettersson Sven Torste Lennart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:20
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/101; C04B35/1015; C04B35/111; C04B35/117; C04B35/515; C04B35/56; C04B35/5607; C04B35/5626; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3217; C04B2235/34; C04B2235/3418; C04B2235/38; C04B2235/3817; C04B2235/3839; C04B2235/3847
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A HARD SINTERED POWDER-METALLURGICAL MATERIAL CONSISTING OF A SINTERED MIXTURE COMPOSED OF THE TWO TUNGSTEN CARBIDES W2C AND WC IN EUTECTIC RATIO, AND A BALANCE OF SUBSTANTIALLY ALL ALLUMINUM OXIDE SAID CARBIDES BEING PRESENT IN NOT LESS THAN 40% BY WEIGHT OF THE TOTAL.
Claim 2
Dependent Claim
44 words
A HARD SINTERED POWDER-METALLURGICAL MATERIAL CONSISTING OF A SINTERED MIXTURE COMPOSED OF THE TWO TUNGSTEN CARBIDES W2C AND WC IN EUTECTIC RATIO, AND A BALANCE OF SUBSTANTIALLY ALL ALLUMINUM OXIDE SAID CARBIDES BEING PRESENT IN NOT LESS THAN 40% BY WEIGHT OF THE TOTAL.
References Cited (Backward Citations)
US1981719A
Cited
US2113171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |