US3835813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration and circulation system and apparatus therefore
Assignee: Individual
•
Filing: 1973-07-18
•
Granted: 1974-09-17
•
Expires: 1993-07-18
Abstract
Abstract A balanced system for purifying aquatic media and maintaining aquatic specimens which comprises biological filtration, mechanical filtration and algae propagation.
Inventors
- 👤 L Katz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:36
CPC Classifications
A; A01; A01K; A01K63/00; A01K63/04; A01K63/045
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
26 words
A combined unit comprising a particulate filtration chamber containing at least one filter material and an algae propagation chamber containing transparent spheres surrounding a light source.
Claim 2
Dependent Claim
26 words
A combined unit comprising a particulate filtration chamber containing at least one filter material and an algae propagation chamber containing transparent spheres surrounding a light source.
Claim 3
Dependent Claim
20 words
A combined unit as defined in claim 1 wherein said particulate filtration chamber contains at least two dissimilar filter materials.
Claim 4
Dependent Claim
39 words
A combined unit as defined in claim 1 wherein said propagation chamber is separated from said particulate filtration chamber by means of a perforated partition and said propagation chamber is lined, on at least two surfaces thereof, with mirrors.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |