US3152007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for chromizing ferrous metal objects
Assignee: Diamond Shamrock Corp
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Filing: 1961-04-13
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Granted: 1964-10-06
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Expires: 1981-04-13
Abstract
No abstract record available.
Inventors
- 👤 Tom S Perrin
- 👤 Douglas H Strong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:07
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/06; C23C10/08; C23C10/10; C23C10/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS FOR CHROMIZING FERROUS METAL OBJECTS COMPRISING THE STEPS OF HEATING THE OBJECT TO BE CHROMIZED AND CHROMIC CHLORIDE IN AN INERT ATMOSPHERE TO A TEMPERATURE SUCH THAT THE VAPOR PRESSURE OF CHROMIC CHLORIDE IS AT LEAST ABOUT 0.015 ATMOSPHERE, SAID CHROMIC CHLORIDE BEING CONTAINED IN A VESSEL WITH A PERFORATED COVER; PASSING HYDROGEN THROUGH THIS SYSTEM TO EFFECT REDUCTION OF A VAPORIZED CHROMIC CHLORIDE TO FORM GASEOUS CHROMOUS CHLORIDE AND CHROMIUM AT APPROXIMATELY THE SAME VAPOR PRESSURE; AND CONTACTING THE SURFACE OF THE OBJECT TO BE CHROMIZED WITH SAID GASEOUS CHROMOUS CHLORIDE AND CHROMIUM.
Claim 2
Dependent Claim
96 words
A PROCESS FOR CHROMIZING FERROUS METAL OBJECTS COMPRISING THE STEPS OF HEATING THE OBJECT TO BE CHROMIZED AND CHROMIC CHLORIDE IN AN INERT ATMOSPHERE TO A TEMPERATURE SUCH THAT THE VAPOR PRESSURE OF CHROMIC CHLORIDE IS AT LEAST ABOUT 0.015 ATMOSPHERE, SAID CHROMIC CHLORIDE BEING CONTAINED IN A VESSEL WITH A PERFORATED COVER; PASSING HYDROGEN THROUGH THIS SYSTEM TO EFFECT REDUCTION OF A VAPORIZED CHROMIC CHLORIDE TO FORM GASEOUS CHROMOUS CHLORIDE AND CHROMIUM AT APPROXIMATELY THE SAME VAPOR PRESSURE; AND CONTACTING THE SURFACE OF THE OBJECT TO BE CHROMIZED WITH SAID GASEOUS CHROMOUS CHLORIDE AND CHROMIUM.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-06 | 1968-04-06 | 1968-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-06 | 1972-04-06 | 1972-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-06 | 1976-04-06 | 1976-10-06 | $7700.00 | Window Closed / Lapsed |