US2638684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for heat-treating combustible solids
Assignee: Dorr Co
•
Filing: 1950-04-07
•
Granted: 1953-05-19
•
Expires: 1970-04-07
Abstract
No abstract record available.
Inventors
- 👤 Walfred W Jukkola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:53
CPC Classifications
F; F26; F26B; F26B3/00; F26B3/02; F26B3/06; F26B3/08; F26B3/088
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1097268A
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US1296906A
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US1680183A
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GB286404A
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USRE21526E
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US2567959A
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US2573906A
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US2465464A
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US2465410A
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US2534728A
Cited
US2528098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |