US1996262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of naphthalene
Assignee: Sherwin Williams Co
•
Filing: 1931-12-17
•
Granted: 1935-04-02
•
Expires: 1951-12-17
Abstract
No abstract record available.
Inventors
- 👤 James D Todd
- 👤 Jay C Owens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:19
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/005; C07C7/04
Claims Analysis
Total Claims: 0
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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) | 1938-04-01 | 1938-10-01 | 1939-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-04-01 | 1942-10-01 | 1943-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-04-01 | 1946-10-01 | 1947-04-02 | $7700.00 | Window Closed / Lapsed |