US4451362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filling for percolating filters for biological waste water purification
Assignee: FELIX SCHOELLER JR A CORP OF WEST GERMANY
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Filing: 1983-02-17
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Granted: 1984-05-29
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Expires: 2003-02-17
Abstract
Abstract A filling for a percolating filter for biological purification of waste water includes a plurality of flexible, irregularly touching, randomly arranged plastic strips up to 8 cm in width and several meters in length twisted together and suspended from a support over the height of the filter tank. The strips may have a maximum thickness of 30-100 μm and a minimum thickness of 10-60 μm, varying in such thicknesses over their width. The strips may be residue edge portion cuttings severed from the production of continuously produced sheet materials.
Inventors
- 👤 Hans-Hugo Spelsberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:33
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/10; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S261/00; Y10S261/72
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
127 words
A filling for a percolating filter for the biological purification of waste water comprising: a plurality of flexible, irregularly touching, randomly arranged hanging elongate strips, having a width of up to 8 cm and a length of several meters the thickness of said strips varying between maximum and minimum thicknesses across the width of said strips, said maximum and minimum thicknesses extending longitudinally of the strips between the longitudinal edges thereof and causing said strips to be stressed and curled; and means supporting said strips in said randomly arranged relationship and such that the longitudinal edges and the longitudinally extending maximum and minimum thicknesses of said strips extend substantially vertically and in the direction of flow of the waste water when the waste water is being purified.
Claim 2
Dependent Claim
127 words
A filling for a percolating filter for the biological purification of waste water comprising: a plurality of flexible, irregularly touching, randomly arranged hanging elongate strips, having a width of up to 8 cm and a length of several meters the thickness of said strips varying between maximum and minimum thicknesses across the width of said strips, said maximum and minimum thicknesses extending longitudinally of the strips between the longitudinal edges thereof and causing said strips to be stressed and curled; and means supporting said strips in said randomly arranged relationship and such that the longitudinal edges and the longitudinally extending maximum and minimum thicknesses of said strips extend substantially vertically and in the direction of flow of the waste water when the waste water is being purified.
Claim 3
Dependent Claim
19 words
The filling of claim 1, wherein said maximum thickness is adjacent one of the longitudinal edges of said strips.
Claim 4
Dependent Claim
18 words
The filling of claim 2, wherein said minimum thickness is adjacent the opposite longitudinal edge of said strips.
Claim 5
Dependent Claim
12 words
The filling of claim 2, wherein said strips are formed of plastic.
Claim 6
Dependent Claim
24 words
The filling of claim 2, wherein said means supports said strips intermediate the ends of the strips when said waste water is being purified.
Claim 7
Dependent Claim
31 words
The filling of claim 1, wherein said maximum thickness is spaced from the longitudinal edges of said strips and said minimum thickness is adjacent at least one of said longitudinal edges.
Claim 8
Dependent Claim
12 words
The filling of claim 5, wherein said strips are formed of plastic.
Claim 9
Dependent Claim
24 words
The filling of claim 5, wherein said means supports said strips intermediate the ends of the strips when said waste water is being purified.
Claim 10
Dependent Claim
12 words
The filling of claim 1, wherein said strips are formed of plastic.
Claim 11
Dependent Claim
12 words
The filling of claim 9, wherein said strips also include cellulose therein.
Claim 12
Dependent Claim
24 words
The filling of claim 1, wherein said means supports said strips intermediate the ends of the strips when said waste water is being purified.
Claim 13
Dependent Claim
15 words
The filling of claim 11, wherein said strips are joined together centrally of their ends.
Claim 14
Dependent Claim
14 words
The filling of claim 11, wherein said strips are joined by twisting them together.
Claim 15
Dependent Claim
24 words
The filling of claim 1, wherein said maximum thickness of said strips is about 30-100 μm and said minimum thickness is about 10-60 μm.
Claim 16
Dependent Claim
12 words
The filling of claim 1, wherein said strips are wedge-shaped in cross-section.
Claim 17
Dependent Claim
12 words
The filling of claim 1, wherein said strips are stepped in cross-section.
Claim 18
Dependent Claim
22 words
The filling of claim 1, wherein said strips are edge portion strips severed from the production of a continuously produced sheet material.
Claim 19
Dependent Claim
18 words
The filling of claim 1, wherein said strips are of a thermoplastic material, built-up from individually applied coatings.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |