US2418528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromium complex compounds
Assignee: National Oil Products Co
•
Filing: 1941-11-21
•
Granted: 1947-04-08
•
Expires: 1961-11-21
Abstract
No abstract record available.
Inventors
- 👤 Edwin A Robinson
- 👤 Ralph M Beach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:50
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2173823A
Cited
US715139A
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US1114120A
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GB146167A
Cited
US1399510A
Cited
GB146181A
Cited
US1764601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-07 | 1950-10-07 | 1951-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-07 | 1954-10-07 | 1955-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-07 | 1958-10-07 | 1959-04-08 | $7700.00 | Window Closed / Lapsed |