US3031807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-solid contactor
Assignee: Dow Chemical Co
•
Filing: 1959-11-02
•
Granted: 1962-05-01
•
Expires: 1979-11-02
Abstract
No abstract record available.
Inventors
- 👤 Harold R Bylsma
- 👤 Douglas S Chisholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:13
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/12; B01D; B01D11/00; B01D11/02; B01D11/0269; B01D11/0273; B01D11/0276; B01F; B01F29/00; B01F29/60; B01F29/63; B29; B29B; B29B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US494463A
Cited
US731092A
Cited
US1168799A
Cited
US2158076A
Cited
DE715805C
Cited
US2427388A
Cited
US2505371A
Cited
US2600367A
Cited
US2933861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-30 | 1965-10-30 | 1966-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-30 | 1969-10-30 | 1970-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-30 | 1973-10-30 | 1974-05-01 | $7700.00 | Window Closed / Lapsed |