Patent US4224839A successfully refreshed from Google Patents.
Patent US2687806A successfully refreshed from Google Patents.
US2687806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonrotatable disk filter with tipping trays
Assignee: Shell Development Co
•
Filing: 1950-03-16
•
Granted: 1954-08-31
•
Expires: 1970-03-16
Abstract
No abstract record available.
Inventors
- 👤 Becker Aloysius Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:29
CPC Classifications
B; B01; B01D; B01D35/00; B01D33/00; B01D33/15; B01D33/17; B01D33/19; B01D35/16; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1106836A
Cited
US2588976A
Cited
US892275A
Cited
US978381A
Cited
US1028789A
Cited
US1284347A
Cited
US1698002A
Cited
US1760244A
Cited
US2013634A
Cited
US2110462A
Cited
US2188840A
Cited
US2352330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |