US2500781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricant purification system and apparatus
Assignee: ZIP ABRASIVE Co
•
Filing: 1944-06-28
•
Granted: 1950-03-14
•
Expires: 1964-06-28
Abstract
No abstract record available.
Inventors
- 👤 Werder Frances Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:07
CPC Classifications
F; F16; F16N; F16N39/00; F16N39/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
FR393934A
Cited
US1484607A
Cited
US1624689A
Cited
US1874976A
Cited
US1555664A
Cited
US1705317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |