US4579319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined sintering-annealing furnace
Assignee: MCL Co Ltd
•
Filing: 1984-06-22
•
Granted: 1986-04-01
•
Expires: 2004-06-22
Abstract
Abstract A combination sintering-annealing furnace is provided, wherein the sintering furnace section and the annealing furnace section are arranged adjacent with each other and separated by a partition wall. A plurality of ventilation windows is provided through the partition wall to allow the waste combustion gas in the sintering furnace to flow into the annealing furnace. The opening area of each ventilation window is adjusted by an adjuster plate. The annealing furnace is also provided with a plurality of cold air inlet ports for introducing therethrough cold air from the atmosphere, the opening area of each cold air inlet port being adjusted by an adjuster plate. A desired temperature distribution in the annealing furnace may be established by controlling the opening areas of the respective ventilation windows and respective cold air inlet ports.
Inventors
- 👤 Nobuyoshi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:10
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/84; C21D9/00; C21D9/0056; F; F27; F27B; F27B9/00; F27B9/02; F27B9/021; F27B9/022; F27B9/023; F27B9/024
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
A combined sintering-annealing furnace, comprising a sintering furnace for sintering therein ceramic shell molds and having a combustion gas discharge duct, an annealing furnace for slowly cooling a cast material contained in said ceramic shell molds and having an air discharge duct and a plurality of adjustable cold air inlet ports, said annealing furnace being disposed adjacent to said sintering furnace and separated from said sintering furnace by a common partition wall having a plurality of adjustable ventilation windows for introducing therethrough hot air from said sintering furnace whereby temperature distribution in the annealing furnace is controlled by adjusting open areas of said adjustable ventilation windows and said adjustable cold air inlet ports.
Claim 2
Dependent Claim
113 words
A combined sintering-annealing furnace, comprising a sintering furnace for sintering therein ceramic shell molds and having a combustion gas discharge duct, an annealing furnace for slowly cooling a cast material contained in said ceramic shell molds and having an air discharge duct and a plurality of adjustable cold air inlet ports, said annealing furnace being disposed adjacent to said sintering furnace and separated from said sintering furnace by a common partition wall having a plurality of adjustable ventilation windows for introducing therethrough hot air from said sintering furnace whereby temperature distribution in the annealing furnace is controlled by adjusting open areas of said adjustable ventilation windows and said adjustable cold air inlet ports.
Claim 3
Dependent Claim
30 words
The combination sintering-annealing furnace according to claim 1, wherein said air discharge duct of said annealing furnace is in communication with said combustion gas discharge duct of said sintering furnace.
Claim 4
Dependent Claim
27 words
The combination sintering-annealing furnace according to claim 1, wherein said sintering furnace includes a plurality of gas burners for raising the temperature therein to a desired temperature.
Claim 5
Dependent Claim
27 words
The combination sintering-annealing furnace according to claim 2, wherein said sintering furnace includes a plurality of gas burners for raising the temperature therein to a desired temperature.
Claim 6
Dependent Claim
45 words
The combination sintering-annealing furnace according to claim 1, wherein said cast material is a magnesium alloy and wherein the temperature distribution in said annealing furnace is controlled to cool said magnesium alloy slowly at least within the temperature range of 565° C. to 470° C.
Claim 7
Dependent Claim
46 words
The combination sintering-annealing furnace according to claim 2, wherein said cast material is a magnesium alloy and wherein the temperature distribution in said annealing furnace is controlled to cool said magnesium alloy slowly at least within the temperature range of from 565° C. to 470° C.
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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |