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US2440707A
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Refining of naphthalene by distillation
Assignee: Beazer East Inc
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Filing: 1942-03-30
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Granted: 1948-05-04
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Expires: 1962-03-30
Abstract
No abstract record available.
Inventors
- 👤 Bernard J C Van Der Hoeven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:42
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/005; B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0009; B01D9/0059; C07C7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1719431A
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US1711351A
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US1986165A
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Cited
US2261939A
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US2290373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-04 | 1951-11-03 | 1952-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-04 | 1955-11-03 | 1956-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-04 | 1959-11-03 | 1960-05-04 | $7700.00 | Window Closed / Lapsed |