Patent US3722870A successfully refreshed from Google Patents.
US3722870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and furnace for sintering
Assignee: Individual
•
Filing: 1970-05-20
•
Granted: 1973-03-27
•
Expires: 1990-05-20
Abstract
Abstract A method and furnace are disclosed for continuous sintering powdered metal products. The furnace includes a high temperature heating zone through which the powdered metal products pass for sintering. The high temperature heating zone includes a thermally stable medium preferably alumina sand, in which the sintered product is carried through the furnace. The invention provides a sintering furnace which is capable of achieving and maintaining higher temperatures in continuous operation than previously possible for commercially operated furnaces.
Inventors
- 👤 J Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:01
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/003
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
17 words
The furnace of claim 1 wherein the cooling means comprises a water-cooled jacket surrounding the outlet conveyor.
Claim 2
Dependent Claim
17 words
The furnace of claim 1 which further includes means for introducing a protective atMosphere into the furnace.
Claim 3
Dependent Claim
19 words
The furnace of claim 1 which further includes means for returning the medium to input end of the conduit.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |