US1798166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beta-naphthol pellet
Assignee: CALCO CHEMICAL CO Inc
•
Filing: 1927-03-24
•
Granted: 1931-03-31
•
Expires: 1947-03-24
Abstract
No abstract record available.
Inventors
- 👤 Carl E Mensing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:43
CPC Classifications
C; C07; C07C; C07C39/00; C07C39/12; C07C39/14; Y; Y10; Y10S; Y10S159/00; Y10S159/23
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1934-03-30 | 1934-09-29 | 1935-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-03-30 | 1938-09-29 | 1939-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-03-30 | 1942-09-29 | 1943-03-31 | $7700.00 | Window Closed / Lapsed |