US2701644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter with medium supported by suction piping
Assignee: Individual
•
Filing: 1952-03-07
•
Granted: 1955-02-08
•
Expires: 1972-03-07
Abstract
No abstract record available.
Inventors
- 👤 Edgar J Griffiths
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:07
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/04; E04D13/0404; E04D13/0409; B; B01; B01D; B01D29/00; B01D29/085; E04D2013/0413; E04D2013/0427; Y; Y10; Y10S; Y10S4/00; Y10S4/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US807547A
Cited
US2273927A
Cited
US2336348A
Cited
US2410010A
Cited
US2465623A
Cited
US2483000A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-07 | 1958-08-09 | 1959-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-07 | 1962-08-09 | 1963-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-07 | 1966-08-09 | 1967-02-08 | $7700.00 | Window Closed / Lapsed |