US2868523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating apparatus and method
Assignee: Kaiser Aluminum and Chemical Corp
•
Filing: 1955-06-02
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Granted: 1959-01-13
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Expires: 1975-06-02
Abstract
No abstract record available.
Inventors
- 👤 Winston H Cundiff
- 👤 Donald J Donaldson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:40
CPC Classifications
F; F28; F28C; F28C3/00; F28C3/06; F28C3/08; B; B01; B01D; B01D1/00; B01D1/14; B01F; B01F35/00; B01F35/90; B01F35/91; F22; F22B; F22B1/00; F22B1/02; F22B1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US816043A
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US1494944A
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US1806394A
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US2055211A
Cited
US2372533A
Cited
US2582198A
Cited
US2759715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |