Patent US3929101A successfully refreshed from Google Patents.
US3929101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration and circulation system and apparatus therefore
Assignee: Individual
•
Filing: 1974-07-10
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Granted: 1975-12-30
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Expires: 1994-07-10
Abstract
Abstract A balanced system for purifying aquatic media and maintaining aquatic specimens which comprises biological filtration, mechanical filtration and algae propagation.
Inventors
- 👤 Louis N Katz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:23
CPC Classifications
A; A01; A01K; A01K63/00; A01K63/04; A01K63/045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
An aquarium comprising a tank for containing aquatic specimens, said tank being filled with suitable aquatic medium; a biological filter positioned within said tank, said filter being perforated and covered by aggregate; a combined unit comprising a particulate filtration chamber and an algae propagation chamber, said chambers being separated by a perforated partition; and means for circulating said medium throughout said tank and through said biological filter and said combined unit.
Claim 2
Dependent Claim
71 words
An aquarium comprising a tank for containing aquatic specimens, said tank being filled with suitable aquatic medium; a biological filter positioned within said tank, said filter being perforated and covered by aggregate; a combined unit comprising a particulate filtration chamber and an algae propagation chamber, said chambers being separated by a perforated partition; and means for circulating said medium throughout said tank and through said biological filter and said combined unit.
Claim 3
Dependent Claim
14 words
An aquarium as defined in claim 1 wherein said aquatic medium is salt water.
Claim 4
Dependent Claim
21 words
An aquarium as defined in claim 1 wherein said biological filter is covered with aggregate material and encloses larger aggregate material.
Claim 5
Dependent Claim
22 words
An aquarium as defined in claim 1 wherein said particulate filtration chamber in said combined unit contains at least one filtration material.
Claim 6
Dependent Claim
19 words
An aquarium as defined in claim 1 wherein said algae propagation chamber contains clear spheres surrounding a light source.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |