US2418909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning composition for removing sludge from internal-combustion engines
Assignee: National Carbon Co Inc
•
Filing: 1945-10-02
•
Granted: 1947-04-15
•
Expires: 1965-10-02
Abstract
No abstract record available.
Inventors
- 👤 George M Skinner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:21
CPC Classifications
C; C10; C10L; C10L10/00; C10L10/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1787789A
Cited
US1822886A
Cited
US1833429A
Cited
US2032174A
Cited
US2128685A
Cited
US2259872A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-14 | 1950-10-14 | 1951-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-14 | 1954-10-14 | 1955-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-14 | 1958-10-14 | 1959-04-15 | $7700.00 | Window Closed / Lapsed |