US3820552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cartridge cleaner
Assignee: LANG AND SON POOLS Inc L
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Filing: 1973-02-22
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Granted: 1974-06-28
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Expires: 1993-02-22
Abstract
Abstract A cartridge cleaner for cleaning filter cartridges which includes a shell having an inner wall defining a bore for receiving a filter cartridge, an annular space in the shell around the inner wall, and an inlet for introducing water or other cleaning liquid into the annular space and then the bore for cleaning a filter cartridge in the bore. The inner wall has apertures in it through which the cleaning liquid can pass from the annular space into the bore.
Inventors
- 👤 R Lang
- 👤 R Carnot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:49
CPC Classifications
B; B01; B01D; B01D41/00; B01D41/04; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/50; B01D29/52; B01D29/62; B01D29/66; B01D29/68; B01D29/96; B01D35/00; B01D35/16; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0438
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
74 words
A cleaner according to claim 1, wherein said inlet means comprises a manually operable valve mounted directly on the top of said outer shell, said valve having a laterally projecting inlet for attachment to the end of a hose and an outlet leading down through the top of the outer shell into the latter''s interior for passing the cleaning liquid from the hose down into said annular space between the outer and inner shells.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |