Patent US4261363A successfully refreshed from Google Patents.
US2312999A
Expired / Lapsed
US
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Filter for separating solids from liquids
Assignee: Individual
•
Filing: 1939-12-19
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Granted: 1943-03-02
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Expires: 1959-12-19
Abstract
No abstract record available.
Inventors
- 👤 Langen Lambertus Hendrik De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:31
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/117; B01D29/76; B01D29/80; B01D29/82; B01D29/822; B30; B30B; B30B9/00; B30B9/02; B30B9/22; B30B9/225
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-03-01 | 1946-08-31 | 1947-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-03-01 | 1950-08-31 | 1951-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-03-01 | 1954-08-31 | 1955-03-02 | $7700.00 | Window Closed / Lapsed |