US3603766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc-image zone-refining furnace
Assignee: Panasonic Holdings Corp
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Filing: 1969-09-15
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Granted: 1971-09-07
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Expires: 1989-09-15
Abstract
Abstract An arc-image zone-refining furnace having an auxiliary spherical mirror located opposite to an ellipsoidal mirror. Provision of the auxiliary spherical mirror makes possible not only the processing of a material in the form of a bar having a large diameter but also the reduction in the speed required to rotate the bar.
Inventors
- 👤 Yoshihiro Kino
- 👤 Yasuhiko Nakayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:44
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/18; H05B7/22; H05B7/225; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1076; Y10T117/1088
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
An arc-image furnace adapted for zone refining a material, comprising an ellipsoidal reflector, a radiation source positioned at the remote focal point of said ellipsoidal reflector and a relatively small spherical reflector disposed opposite to and facing said ellipsoidal reflector and having its focal point close to the other focal point of said ellipsoidal reflector, the axis of which is disposed on the major axis of said ellipsoidal reflector.
Claim 2
Dependent Claim
69 words
An arc-image furnace adapted for zone refining a material, comprising an ellipsoidal reflector, a radiation source positioned at the remote focal point of said ellipsoidal reflector and a relatively small spherical reflector disposed opposite to and facing said ellipsoidal reflector and having its focal point close to the other focal point of said ellipsoidal reflector, the axis of which is disposed on the major axis of said ellipsoidal reflector.
References Cited (Backward Citations)
DE387901C
Cited
US2354658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |