US2596981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for nitriding metallic surfaces
Assignee: United States Steel Corp
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Filing: 1949-10-05
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Granted: 1952-05-20
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Expires: 1969-10-05
Abstract
No abstract record available.
Inventors
- 👤 Roy L Chenault
- 👤 Gerald E Mohnkern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:04
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/24; C23C8/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A METHOD OF NITRIDING SURFACES OF METALLIC ARTICLES WHICH COMPRISES CONFINING THE SURFACE OF A METALLIC ARTICLE AND A CAPSULE CONTAINING LIQUID AMMONIA IN APPROXIMATELY THE AMOUNT OF 5 TO 12 GRAMS PER SQUARE FOOT OF SAID SURFACE IN A SEALED SPACE, AND HEATING SAID SURFACE AND SAID CAPSULE TO A TEMPERATURE APPROXIMATELY BETWEEN 800* AND 1200* C. AND THEREBY RELEASING AMMONIA FROM THE CAPSULE AS A VAPOR, BUT CONFINING THIS VAPOR WITHIN SAID SEALED SPACE.
Claim 2
Independent Claim
76 words
A METHOD OF NITRIDING SURFACES OF METALLIC ARTICLES WHICH COMPRISES CONFINING THE SURFACE OF A METALLIC ARTICLE AND A CAPSULE CONTAINING LIQUID AMMONIA IN APPROXIMATELY THE AMOUNT OF 5 TO 12 GRAMS PER SQUARE FOOT OF SAID SURFACE IN A SEALED SPACE, AND HEATING SAID SURFACE AND SAID CAPSULE TO A TEMPERATURE APPROXIMATELY BETWEEN 800* AND 1200* C. AND THEREBY RELEASING AMMONIA FROM THE CAPSULE AS A VAPOR, BUT CONFINING THIS VAPOR WITHIN SAID SEALED SPACE.
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) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |