US3790413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for a continuous heat treatment and apparatus therefor
Assignee: Kito KK
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Filing: 1971-12-27
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Granted: 1974-02-05
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Expires: 1991-12-27
Abstract
Abstract A heat treating process for a link chain or a similar article, characterized wherein a link chain or a similar article is conveyed through a high frequency induction coil and simultaneously heated at an elevated temperature, and is then cooled after a predetermined period of time.
Inventors
- 👤 N Kanetake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:51
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/20; C23C8/22; C21; C21D; C21D1/00; C21D1/34; C21D1/42; C21D9/00; C21D9/0087; C21D9/52; C21D9/54; C21D9/56; C21D9/60; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
In a heat treating process for a link chain article wherein the article is conveyed through a high frequency coil and simultaneously heated at an elevated temperature, and is then cooled after a predetermined period of time, the improvement therein wherein the treated article is heated at different tempering temperatures over different portions of the article, and is cooled after a predetermined period of time, resulting in the different hardness over different areas of the article.
Claim 2
Dependent Claim
81 words
In a heat treating process for a link chain article wherein the article is conveyed through a high frequency coil and simultaneously heated at an elevated temperature, and is then cooled after a predetermined period of time, the improvement therein wherein the process is carried out in a carburization atmosphere and the treated article is simultaneously heated at an elevated termperature, and is cooled after a predetermined period of time, resulting in formation of the desired carburized layer in said article.
Claim 3
Dependent Claim
89 words
In a heat treating process for a link chain article wherein the article is conveyed through a high frequency coil and simultaneously heated at an elevated temperature, and is then Cooled after a predetermined period of time, the improvement therein wherein the process is carried out in a carburizing atmosphere and the treated article is simultaneously heated at different temperatures over different areas of the article, and is cooled after a predetermined period of time, resulting in the formation of different carburized layers over different areas of the article.
Claim 4
Dependent Claim
86 words
In a heat treating process for a link chain article wherein the article is conveyed through a high frequency coil and simultaneously heated at an elevated temperature, and is then cooled after a predetermined period of time, the improvement therein wherein the process is carried out in a heat treatment gas atmosphere and the treated article is simultaneously heated at an elevated temperature, and is cooled after a predetermined period of time, resulting in the establishment of atmosphere heat treatment on the surface of said article.
Claim 5
Dependent Claim
111 words
In a heat treating process for a link chain article wherein the article is conveyed through a high frequency coil and simultaneously heated at an elevated temperature, and is then cooled after a predetermined period of time, the improvement therein wherein the process is carried out in the presence of a non-oxidiaing and bright heating gas and the trated article is simultaneously heated at different temperatures over different portions of the article, and is cooled after a predetermined period of time, resulting in the formation of the different metallic structures over different portions of the article as well as the establishment of non-oxidation and non-decarburization of the surface of said article.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |