US2696309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drum filter
Assignee: Individual
•
Filing: 1950-06-22
•
Granted: 1954-12-07
•
Expires: 1970-06-22
Abstract
No abstract record available.
Inventors
- 👤 Bultman Laurence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:12
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/06; B01D33/073; B01D33/09; B01D33/44; B01D33/46; B01D33/463; B01D33/466
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1590233A
Cited
US1667465A
Cited
US1748081A
Cited
US1887143A
Cited
US1892306A
Cited
US2362300A
Cited
US2461824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-06 | 1958-06-07 | 1958-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-06 | 1962-06-07 | 1962-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-06 | 1966-06-07 | 1966-12-07 | $7700.00 | Window Closed / Lapsed |