US3141918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zone temperature controlled bath furnace
Assignee: Kokusai Denki Electric Inc
•
Filing: 1961-04-20
•
Granted: 1964-07-21
•
Expires: 1981-04-20
Abstract
No abstract record available.
Inventors
- 👤 Tanaka Yukio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:32
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/2401; C; C21; C21D; C21D9/00; C21D9/0006; F; F27; F27B; F27B15/00; F27B15/02; F27B15/14; G05D23/1927; G05D23/193; G05D23/1932; G05D23/1934; G05D23/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US764592A
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US1670846A
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US1985967A
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US2158135A
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US2158136A
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US2350734A
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FR890371A
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US2354753A
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US2421224A
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US2508004A
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US3086385A
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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) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |