Patent US2991389A successfully refreshed from Google Patents.
US2991389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cesium ovens
Assignee: National Co Inc
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Filing: 1959-01-16
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Granted: 1961-07-04
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Expires: 1979-01-16
Abstract
No abstract record available.
Inventors
- 👤 Eugene F Grant
- 👤 Gordon E Simpson
- 👤 Arthur O Mccoubrey
- 👤 Robert S Buritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:12
CPC Classifications
H; H05; H05H; H05H3/00; H05H3/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |