US4717519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a string-shaped bacteria bed for sewage or wastewater treatment
Assignee: Individual
•
Filing: 1987-03-11
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Granted: 1988-01-05
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Expires: 2007-03-11
Abstract
Abstract A method for producing a string-shaped bacteria bed having many loops of fiber on the whole surface thereof, which is used for sewage or wastewater treatment, characterized by preparing a narrow strip of cloth made from a thermoplastic material, having many loops of fiber on the obverse thereof, and heating the reverse thereof having no loops of fiber by contacting it with a heating rod while tensing and drawing it diagonally, thereby the strip of cloth is diagonally curled and stranded by heat to form a string having many loops of fiber on the whole surface thereof. In such a method, the string, having high holding capacity of bacteria colony, is obtained by simplified installation.
Inventors
- 👤 Koji Sagami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:09
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/14; B29C53/02; C; C02; C02F; C02F3/00; C02F3/02; C02F3/10; C02F3/103; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S264/00; Y10S264/71; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T428/00; Y10T428/24; Y10T428/24008; Y10T428/24017
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
96 words
A method for producing a string-shaped bacteria bed having many loops of fiber on the whole surface thereof, which is used for sewage or wastewater treatment, comprising preparing a narrow strip of cloth made from a thermoplastic material, having many loops of fiber on the obverse thereof, and heating the reverse thereof having no loops of fiber by contacting it with a heating rod while tensing and drawing it diagonally, thereby the strip of cloth is diagonally curled and stranded by heat to form a string having many loops of fiber on the whole surface thereof.
Claim 2
Independent Claim
96 words
A method for producing a string-shaped bacteria bed having many loops of fiber on the whole surface thereof, which is used for sewage or wastewater treatment, comprising preparing a narrow strip of cloth made from a thermoplastic material, having many loops of fiber on the obverse thereof, and heating the reverse thereof having no loops of fiber by contacting it with a heating rod while tensing and drawing it diagonally, thereby the strip of cloth is diagonally curled and stranded by heat to form a string having many loops of fiber on the whole surface thereof.
Claim 3
Dependent Claim
26 words
A method for producing a string-shaped bacteria bed according to claim 1, wherein the heating rod is kept at a temperature of 300° to 350° C.
Claim 4
Dependent Claim
23 words
A method for producing a string-shaped bacteria bed according to claim 1, wherein the drawing speed is kept at 8 to 10 m/sec..
Claim 5
Dependent Claim
33 words
A method for producing a string-shaped bacteria bed according to claim 1, wherein the drawing angle is kept at an angle of 30° to 60° to the longitudinal direction of said heating rod.
Claim 6
Dependent Claim
24 words
A method for producing a string-shaped bacteria bed according to claim 1, wherein the cross sectional view of the string is a round shape.
References Cited (Backward Citations)
US2703774A
Cited
US2627644A
Cited
US2977664A
Cited
US3416991A
Cited
US3616152A
Cited
US3959051A
Cited
JPS49134965A
Cited
US4102456A
Cited
US4411780A
Cited
JPS59225793A
Cited
JPS60172398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |