US2552183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stage causticizing
Assignee: Dorr Co
•
Filing: 1945-09-19
•
Granted: 1951-05-08
•
Expires: 1965-09-19
Abstract
No abstract record available.
Inventors
- 👤 Cyril H Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:58
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C01D1/28; D; D21; D21C; D21C11/00; D21C11/0064; Y; Y10; Y10S; Y10S423/00; Y10S423/03
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) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |