US2640532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction furnace and evaporator
Assignee: Individual
•
Filing: 1949-10-08
•
Granted: 1953-06-02
•
Expires: 1969-10-08
Abstract
No abstract record available.
Inventors
- 👤 Bowen William Spencer
- 👤 John E Viscardi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:17
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/16; B01D1/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US274048A
Cited
US861593A
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US1722175A
Cited
US1799643A
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US2184300A
Cited
US2287476A
Cited
US2365194A
Cited
US2445327A
Cited
US2506646A
Cited
US2530077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |