Patent US2858235A successfully refreshed from Google Patents.
US2858235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating
Assignee: JACK F GOVAN
•
Filing: 1953-03-17
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Granted: 1958-10-28
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Expires: 1973-03-17
Abstract
No abstract record available.
Inventors
- 👤 Carl A M Rex
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:14
CPC Classifications
C; C23; C23D; C23D5/00; C23D5/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A METHOD OF PROTECTING METAL ARTICLES FROM OXIDATION AT HIGH TEMPERATURES WHICH METAL ARTICLES ARE IN THE FORM OF A POROUS BRIQUETTE MADE BY COMPACTING FINELY DIVIDED METAL POWDER WHICH COMPRISES APPLYING A LIQUID VITEROUS COATING COMPOSITION TO THE SURFACE OF SAID BRIQUETTE, SAID COATING COMPOSITION CONTAINING SODIUM META BORATE AS AN INGREDIENT THEREIN, DRYING SAID COATING AND DENSIFYING SAID BRIQUETTE UNDER HEAT AND PRESSURE AND DENSIFYING BEING ACCOMPLISHED BY HOT NOT FORGOING SAID COATED POROUS ARTICLE AT A PRESSURE OF AT LEAST 200 LBS. PER SQUARE INCH WHILE THE TEMPERATURE OF THE ARTICLE IS APPROXIMATELY AT THE NORMAL FORGOING TEMPERATURE OF SAID METAL, WHEREBY THE BASE METAL OF SAID ARTICLE IS DENSIFIED AND AT THE SAME TIME SAID COATING COMPOSITION HAS PENETRATED A SLIGHT DEPTH BELOW THE OUTER SURFACE OF SAID METAL AND IS VITRIFFIED THEREON.
Claim 2
Independent Claim
137 words
A METHOD OF PROTECTING METAL ARTICLES FROM OXIDATION AT HIGH TEMPERATURES WHICH METAL ARTICLES ARE IN THE FORM OF A POROUS BRIQUETTE MADE BY COMPACTING FINELY DIVIDED METAL POWDER WHICH COMPRISES APPLYING A LIQUID VITEROUS COATING COMPOSITION TO THE SURFACE OF SAID BRIQUETTE, SAID COATING COMPOSITION CONTAINING SODIUM META BORATE AS AN INGREDIENT THEREIN, DRYING SAID COATING AND DENSIFYING SAID BRIQUETTE UNDER HEAT AND PRESSURE AND DENSIFYING BEING ACCOMPLISHED BY HOT NOT FORGOING SAID COATED POROUS ARTICLE AT A PRESSURE OF AT LEAST 200 LBS. PER SQUARE INCH WHILE THE TEMPERATURE OF THE ARTICLE IS APPROXIMATELY AT THE NORMAL FORGOING TEMPERATURE OF SAID METAL, WHEREBY THE BASE METAL OF SAID ARTICLE IS DENSIFIED AND AT THE SAME TIME SAID COATING COMPOSITION HAS PENETRATED A SLIGHT DEPTH BELOW THE OUTER SURFACE OF SAID METAL AND IS VITRIFFIED THEREON.
References Cited (Backward Citations)
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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) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |