US3916047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated steel form for use in a coreless induction furnace
Assignee: Individual
•
Filing: 1973-08-21
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Granted: 1975-10-28
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Expires: 1993-08-21
Abstract
Abstract A coating composition is provided for coating a steel form which is to be used in a coreless induction furnace. The composition includes as essential ingredients compounds selected from the groups consisting of chromium oxide, zirconium oxide and olivines. The coating is applied to the exterior surface of a steel form. The coated steel form thereafter is employed in a coreless induction furnace. A heat of molten metal is developed within the form during which heat the metal form itself melts and the coating combines with the silica within the coreless electric furnace to form a hard, glassy cavity which will resist chemical reactions from metal and slag and temperatures above 3,000*F.
Inventors
- 👤 Raymond J Niesen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:50
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/66; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/632; F; F27; F27B; F27B3/00; F27B3/10; F27B3/12; C04B2111/00; C04B2111/00474; C04B2111/00612; C04B2111/0087; C04B2111/00887; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3231; C04B2235/3241; C04B2235/3244; C04B2235/34; C04B2235/3427; C04B2235/3436; C04B2235/3445; C04B2235/70; C04B2235/96; C04B2235/9669; C04B2235/9676; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
A STEEL FORM FOR USE IN A CORELESS INDUCTION FURNACE COMPRISING A STEEL SHELL IN THE SHAPE OF A CUP AND HAVING A THICKNESS FROM ABOUT 1/8 TO ABOUT 1/2 INCH AND HAVING A REFRACTORY COATING APPLIED OVER THE ENTIRE LOWER MAJOR PORTION OF THE EXTERIOR SURFACE OF THE FORM, SAID COATING HAVING A THICKNESS RANGING FROM ABOUT 1/8 INC TO ABOUT 2 INCHES AND COMPRISING A MOISTURE-FREE COATING CONTAINING BETWEEN ABOUT. 40 TO 60 PARTS BY WEIGHT OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF CHROMIUM OXIDE, ZIRCONIUM OXIDE AND OLIVINE, 0.5 - 5 PARTS BY WEIGHT OF A AN EMULSIFIER, 0.5 - 2 PARTS BY WEIGHT OF BORIC ACID, 0.1 - 1 PART BY WEIGHT OF AN ALKALINE EARTH METAL CARBONATE.
Claim 2
Dependent Claim
124 words
A STEEL FORM FOR USE IN A CORELESS INDUCTION FURNACE COMPRISING A STEEL SHELL IN THE SHAPE OF A CUP AND HAVING A THICKNESS FROM ABOUT 1/8 TO ABOUT 1/2 INCH AND HAVING A REFRACTORY COATING APPLIED OVER THE ENTIRE LOWER MAJOR PORTION OF THE EXTERIOR SURFACE OF THE FORM, SAID COATING HAVING A THICKNESS RANGING FROM ABOUT 1/8 INC TO ABOUT 2 INCHES AND COMPRISING A MOISTURE-FREE COATING CONTAINING BETWEEN ABOUT. 40 TO 60 PARTS BY WEIGHT OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF CHROMIUM OXIDE, ZIRCONIUM OXIDE AND OLIVINE, 0.5 - 5 PARTS BY WEIGHT OF A AN EMULSIFIER, 0.5 - 2 PARTS BY WEIGHT OF BORIC ACID, 0.1 - 1 PART BY WEIGHT OF AN ALKALINE EARTH METAL CARBONATE.
Claim 3
Dependent Claim
15 words
The steel form of claim 1 wherein the alkaline earth metal carbonate is calcium carbonate.
Claim 4
Dependent Claim
26 words
The steel form of claim 1 wherein the said compound is in the form of particles having a size smaller than 5 mesh U.S. standard screen.
References Cited (Backward Citations)
US2069903A
Cited
US2757219A
Cited
US2809126A
Cited
US2947114A
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US3079452A
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US3303032A
Cited
US3533815A
Cited
US3492383A
Cited
US3737489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |