US2447680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering system
Assignee: Briggs Filtration Co
•
Filing: 1943-06-21
•
Granted: 1948-08-24
•
Expires: 1963-06-21
Abstract
No abstract record available.
Inventors
- 👤 Walter C Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:11
CPC Classifications
F; F16; F16N; F16N39/00; F16N39/06; B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/50; B01D29/52; B01D35/00; B01D35/14; B01D35/147; B01D36/00; B01D36/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US409210A
Cited
US457008A
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US1020774A
Cited
GB190824780A
Cited
US1778596A
Cited
US1870885A
Cited
US2041048A
Cited
US2230174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-24 | 1952-02-23 | 1952-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-24 | 1956-02-23 | 1956-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-24 | 1960-02-23 | 1960-08-24 | $7700.00 | Window Closed / Lapsed |