US3468633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Countercurrent solid-liquid treating apparatus
Assignee: NL Chemicals Inc
•
Filing: 1966-06-17
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Granted: 1969-09-23
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Expires: 1986-06-17
Abstract
No abstract record available.
Inventors
- 👤 Andrew P Honchar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:08
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1204; C22B34/1213
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1474062A
Cited
US2000606A
Cited
GB502342A
Cited
US2719206A
Cited
US2745888A
Cited
US2946667A
Cited
GB932056A
Cited
US3233879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |