US2547277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter washing system
Assignee: Individual
•
Filing: 1947-07-28
•
Granted: 1951-04-03
•
Expires: 1967-07-28
Abstract
No abstract record available.
Inventors
- 👤 Herbert H Marsh
- 👤 Glenn G Short
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:39
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D29/50; B01D29/56; B01D29/88; B01D29/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1989306A
Cited
US869372A
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US1219796A
Cited
US1510568A
Cited
FR629059A
Cited
US2013776A
Cited
US2087775A
Cited
US2044096A
Cited
US2435201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |