US2520334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of selective carburization
Assignee: Borg Warner Corp
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Filing: 1947-09-11
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Granted: 1950-08-29
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Expires: 1967-09-11
Abstract
No abstract record available.
Inventors
- 👤 Robert J Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:41
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/20; C23C8/22; C23C8/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
55 words
A METHOD OF CARBURIZING ARTICLES OF STEEL IN WHICH PORTIONS OF THE SURFACES OF THE ARTICLES ARE CARBURIZED TO A LESS EXTENT THAN THE REMAINING SURFACES OF THE ARTICLES, WHICH METHOD INCLUDES, MASKING THE SURFACES OF THE ARTICLE TO BE CARBURIZED TO A LESS EXTENT WITH A PERMEABLE MASKING MATERIAL COMPRISES OF ASBESTOS WHICH IS
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) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |