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US2619256A
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Assignee: Dow Chemical Co
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Filing: 1949-12-09
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Granted: 1952-11-25
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Expires: 1969-12-09
Abstract
No abstract record available.
Inventors
- 👤 Ralph M Wiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:16
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/0015; B01J8/002; B01F; B01F35/00; B01F35/80; B01F35/88; B01F35/881; G; G01; G01G; G01G11/00; G01G11/08; G01G11/083; G05; G05D; G05D7/00; G05D7/06; G05D7/0605
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) | 1955-11-25 | 1956-05-26 | 1956-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-25 | 1960-05-26 | 1960-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-25 | 1964-05-26 | 1964-11-25 | $7700.00 | Window Closed / Lapsed |