US2739907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for imparting an improved finish to the surface of metals by means of diffusion treatment
Assignee: Individual
•
Filing: 1951-07-12
•
Granted: 1956-03-27
•
Expires: 1971-07-12
Abstract
No abstract record available.
Inventors
- 👤 Nowak Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:14
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C10/00; C23C10/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS FOR IMPARTING AN IMPROVED FINISH TO A BASE METAL SURFACE BY A DIFFUSION TREATMENT, WHICH COMPRISES CONTACTING SAID BASE METAL SURFACE SELECTED FROM THE GROUP CONSISTING OF IRON, COPPER AND TIN WITH A VAPORIZED HALIDE OF A POLYVALENT ELEMENT CAPABLE OF CHEMICALLY REPLACING THE BASE METAL AT SAID SURFACE, AND SUFFICIENT FREE HALOGEN VAPOR TO ASSURE COMPLETE HALOGENATION OF THE BASE METAL HALIDE RESULTING FROM THE REPLACEMENT REACTION, SAID TREATMENT BEING EFFECTED AT AN ELEVATED TEMPERATURE ABOVE THE VAPORIZATION POINT OF THE BASE METAL HALIDE BUT BELOW THE MELTING POINT OF THE BASE METAL.
Claim 2
Dependent Claim
96 words
A PROCESS FOR IMPARTING AN IMPROVED FINISH TO A BASE METAL SURFACE BY A DIFFUSION TREATMENT, WHICH COMPRISES CONTACTING SAID BASE METAL SURFACE SELECTED FROM THE GROUP CONSISTING OF IRON, COPPER AND TIN WITH A VAPORIZED HALIDE OF A POLYVALENT ELEMENT CAPABLE OF CHEMICALLY REPLACING THE BASE METAL AT SAID SURFACE, AND SUFFICIENT FREE HALOGEN VAPOR TO ASSURE COMPLETE HALOGENATION OF THE BASE METAL HALIDE RESULTING FROM THE REPLACEMENT REACTION, SAID TREATMENT BEING EFFECTED AT AN ELEVATED TEMPERATURE ABOVE THE VAPORIZATION POINT OF THE BASE METAL HALIDE BUT BELOW THE MELTING POINT OF THE BASE METAL.
References Cited (Backward Citations)
US1939712A
Cited
US1964322A
Cited
US2313410A
Cited
US2501051A
Cited
US2438892A
Cited
US2536774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |