Patent US2454409A successfully refreshed from Google Patents.
US2454409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of sulfur compounds
Assignee: Phillips Petroleum Co
•
Filing: 1943-10-19
•
Granted: 1948-11-23
•
Expires: 1963-10-19
Abstract
No abstract record available.
Inventors
- 👤 Walter A Schulze
- 👤 Willie W Crouch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:43
CPC Classifications
C; C07; C07C; C07C319/00; C07C319/02; C07C319/04; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1836170A
Cited
US1836183A
Cited
US1836171A
Cited
US2101096A
Cited
US2051807A
Cited
US2052268A
Cited
US2211990A
Cited
US2275312A
Cited
US2352435A
Cited
GB532676A
Cited
US2296399A
Cited
US2252138A
Cited
US2366453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-23 | 1952-05-24 | 1952-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-23 | 1956-05-24 | 1956-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-23 | 1960-05-24 | 1960-11-23 | $7700.00 | Window Closed / Lapsed |