US2736670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of surface treating and extruding die with chromium
Assignee: National Glass Co Inc
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Filing: 1954-09-17
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Granted: 1956-02-28
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Expires: 1974-09-17
Abstract
No abstract record available.
Inventors
- 👤 Edward M Griffiths
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:12
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/60; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/939; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/1284; Y10T428/12861; Y10T428/12951; Y10T428/12972
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
IN A METHOD OF SURFACE TREATING AN EXTRUDING DIE FORMED OF STEEL OF APPROXIMATELY 50 ROCKWELL C HARDNESS COMPRISING THE STEPS OF COATING SAID DIE WITH A LAYER OF CHROMIUM OF PREDETERMINED THICKNESS, HEATING SAID COATED DIE AT APPROXIMATELY 2800* F. FOR A PERIOD OF APPROXIMATELY SIX HOURS TO FORM AN AUSTENITIC CHROME STEEL LAYER RESULTING FROM PENETRATION OF THE STEEL BY THE CHROMIUM, AIR COOLING SAID HEATED DIE FOR APPROXIMATELY SIX HOURS TO STABILIZE THE AUSTENITIC LAYER FORMED ON THE SURFACE OF SAID DIE, REHEATING SAID DIE AT APPROXIMATELY 1800* F. TO OBTAIN A FINE GRAIN OF AUSTENETIC LAYER ON THE SURFACE OF SAID DIE, AND COOLING SAID DIE TO FORM A SURFACE RESISTING TO CORROSION AND ELECTROLYTIC ACTION DURING AN EXTRUDING OPERATION.
Claim 2
Dependent Claim
124 words
IN A METHOD OF SURFACE TREATING AN EXTRUDING DIE FORMED OF STEEL OF APPROXIMATELY 50 ROCKWELL C HARDNESS COMPRISING THE STEPS OF COATING SAID DIE WITH A LAYER OF CHROMIUM OF PREDETERMINED THICKNESS, HEATING SAID COATED DIE AT APPROXIMATELY 2800* F. FOR A PERIOD OF APPROXIMATELY SIX HOURS TO FORM AN AUSTENITIC CHROME STEEL LAYER RESULTING FROM PENETRATION OF THE STEEL BY THE CHROMIUM, AIR COOLING SAID HEATED DIE FOR APPROXIMATELY SIX HOURS TO STABILIZE THE AUSTENITIC LAYER FORMED ON THE SURFACE OF SAID DIE, REHEATING SAID DIE AT APPROXIMATELY 1800* F. TO OBTAIN A FINE GRAIN OF AUSTENETIC LAYER ON THE SURFACE OF SAID DIE, AND COOLING SAID DIE TO FORM A SURFACE RESISTING TO CORROSION AND ELECTROLYTIC ACTION DURING AN EXTRUDING OPERATION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |