US3666919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casting oven
Assignee: FRANK M THIEL
•
Filing: 1971-06-14
•
Granted: 1972-05-30
•
Expires: 1991-06-14
Abstract
Abstract The invention is concerned with an electrically energized casting oven of the crucible type, and one which may be used, for example, for melting precious metals at elevated temperatures of the order of 2,400* F. The oven of the invention includes a coil of resistance steel, or other appropriate resistance material, rather than carbon electrodes, as the heating element.
Inventors
- 👤 Frank M Thiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:17
CPC Classifications
F; F27; F27B; F27B17/00; F27B17/02; F27B14/00; F27B14/06; F27D; F27D99/00; F27D99/0001; F27D99/0006; F27D2099/0008; Y; Y10; Y10S; Y10S164/00; Y10S164/04; Y10S266/00; Y10S266/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
Apparatus for casting precious metal, and the like, including a cylindrical oven member forming a crucible for the metal; a helically wound coil of electrically resistance material surrounding the crucible and responding to electric current to produce elevated temperatures in excess of 2,000* F. in the crucible, thermally insulating material surrounding said heating coil and said crucible, and said oven member being pivotally mounted on a turntable to be tilted about a horizontal axis as the turntable is turned about a vertical axis.
Claim 2
Dependent Claim
83 words
Apparatus for casting precious metal, and the like, including a cylindrical oven member forming a crucible for the metal; a helically wound coil of electrically resistance material surrounding the crucible and responding to electric current to produce elevated temperatures in excess of 2,000* F. in the crucible, thermally insulating material surrounding said heating coil and said crucible, and said oven member being pivotally mounted on a turntable to be tilted about a horizontal axis as the turntable is turned about a vertical axis.
Claim 3
Dependent Claim
15 words
The apparatus defined in claim 1, in which the coil is formed of resistance steel.
Claim 4
Dependent Claim
16 words
The apparatus defined in claim 1, in which the coil is formed of a ceramic material.
Claim 5
Dependent Claim
27 words
The apparatus defined in claim 1, and which includes a clamp affixed to tHe top of the aforesaid oven to mount a flask mold over the crucible.
Claim 6
Dependent Claim
51 words
The apparatus defined in claim 1, and which includes electric tables extending from an energizing source to the aforesaid coil to energize the coil when the turntable is stationary, and disconnect means for disconnecting the aforesaid tables from the energizing source when the turntable is turned about the aforesaid vertical axis.
References Cited (Backward Citations)
US1745455A
Cited
US2525882A
Cited
US2708710A
Cited
US2720686A
Cited
US2851579A
Cited
US2907861A
Cited
US3179731A
Cited
US3430032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |