Patent US2678850A successfully refreshed from Google Patents.
US2678850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent filtering system and filter powder dispenser for such system
Assignee: Individual
•
Filing: 1949-02-21
•
Granted: 1954-05-18
•
Expires: 1969-02-21
Abstract
No abstract record available.
Inventors
- 👤 Childres James Alton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:08
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/687
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1468966A
Cited
US563237A
Cited
DE268276C
Cited
US652992A
Cited
US998994A
Cited
US990369A
Cited
US1284750A
Cited
FR535293A
Cited
US1390271A
Cited
US1645973A
Cited
US1847221A
Cited
US1932569A
Cited
US2087775A
Cited
US2216921A
Cited
US2486650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-17 | 1957-11-16 | 1958-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-17 | 1961-11-16 | 1962-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-17 | 1965-11-16 | 1966-05-18 | $7700.00 | Window Closed / Lapsed |