Patent US4957868A successfully refreshed from Google Patents.
US4957868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylindrical hollow carriers for microorganisms made of nonwoven fabric
Assignee: Chiyoda Corp
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Filing: 1988-08-31
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Granted: 1990-09-18
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Expires: 2008-08-31
Abstract
Abstract A cylindrical hollow carrier for microorganisms is prepared by subjecting a nonwoven fabric having a specific gravity of not greater than 1.0 to a surface smoothing treatment at an elevated temperature of 200 DEG to 450 DEG C., then pressing with a roller to give the nonwoven fabric a thickness of 1 to 5 mm and a weight per unit area of 30 to 300 mg/cm2 and then forming the nonwoven fabrics into a cylindrical hollow shape. The carrier has a compression weight of not less than 400 g, and preferably an outer diameter of about 25 to 100 mm and a length of about 40 to 60 mm. The nonwoven fabric may be formed of 35 to 90% fibers of 50 to 600 denier and 10 to 65% fibers of 20 to 1 denier.
Inventors
- 👤 Yoshinori Yushina
- 👤 Jun Hasegawa
- 👤 Hiromi Satoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:37
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/08; C02F3/085; C02F3/087; C02F3/10; C02F3/103; C02F3/12; C02F3/22; C02F3/223; C12; C12M; C12M25/00; C12M25/10; C12N; C12N11/00; C12N11/02; C12N11/08; C12N11/082; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S435/00; Y10S435/813
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
141 words
A method for producing a cylindrical hollow carrier for microorganisms having a compression weight of not less than 400 g per carrier which comprises subjecting a nonwoven fabric having a specific gravity of not greater than 1.0 to a surface smoothing treatment at an elevated temperature of 200° to 450° C., then pressing with a roller to give the nonwoven fabric a thickness of 1 to 5 mm and a weight per unit area of 30 to 300 mg/cm 2 and then forming the nonwoven fabrics into a cylindrical hollow shape; said compression weight being measured by applying a spot weight to an upper part of the cylindrical hollow shaped carrier having an outer diameter of 50 mm and a length of 50 mm and gradually increasing the weight until the upper part is brought into contact with the lower part.
Claim 2
Independent Claim
141 words
A method for producing a cylindrical hollow carrier for microorganisms having a compression weight of not less than 400 g per carrier which comprises subjecting a nonwoven fabric having a specific gravity of not greater than 1.0 to a surface smoothing treatment at an elevated temperature of 200° to 450° C., then pressing with a roller to give the nonwoven fabric a thickness of 1 to 5 mm and a weight per unit area of 30 to 300 mg/cm 2 and then forming the nonwoven fabrics into a cylindrical hollow shape; said compression weight being measured by applying a spot weight to an upper part of the cylindrical hollow shaped carrier having an outer diameter of 50 mm and a length of 50 mm and gradually increasing the weight until the upper part is brought into contact with the lower part.
Claim 3
Dependent Claim
16 words
The method of claim 1, wherein the surface smoothing treatment temperature is 300° to 400° C.
Claim 4
Dependent Claim
17 words
The method of claim 2, wherein said thickness of the nonwoven fabric is 2 to 4 mm.
Claim 5
Dependent Claim
18 words
The method of claim 3, wherein said weight per unit area is 50 to 200 mg/cm 2 .
Claim 6
Dependent Claim
20 words
The method of claim 4, wherein said cylindrical hollow shape has an outer diameter of about 25 to 100 mm.
Claim 7
Dependent Claim
30 words
The method of claim 5, wherein said cylindrical hollow shape is longer than 100 mm and further comprising cutting said cylindrical hollow shape into cylinders of about 40-60 mm long.
Claim 8
Dependent Claim
17 words
The method of claim 1, wherein said thickness of the nonwoven fabric is 2 to 4 mm.
Claim 9
Dependent Claim
18 words
The method of claim 1, wherein said weight per unit area is 50 to 200 mg/cm 2 .
Claim 10
Dependent Claim
20 words
The method of claim 1, wherein said cylindrical hollow shape has an outer diameter of about 25 to 100 mm.
Claim 11
Dependent Claim
33 words
The method of claim 1, wherein said nonwoven fabric is formed of 35 to 90% of fibers of 50 to 600 denier and 10% to 65% of fibers of 20 to 1 denier.
Claim 12
Dependent Claim
144 words
A hollow cylindrical carrier for microorganisms having a compression weight of not less than 400 g per carrier, said carrier being made by a process which comprises subjecting a nonwoven fabric having a specific gravity of not greater than 1.0 to a surface smoothing treatment at an elevated temperature of 200° to 450° C., then pressing with a roller to give a nonwoven fabric a thickness of 1 to 5 mm and a weight per unit area of 30 to 300 mg/cm 2 and then forming the nonwoven fabrics into a cylindrical hollow shape; said compression weight being measured by applying a spot weight to an upper part of the cylindrical hollow shaped carrier having an outer diameter of 50 mm and a length of 50 mm and gradually increasing the weight until the upper part is brought into contact with the lower part.
Claim 13
Dependent Claim
144 words
A hollow cylindrical carrier for microorganisms having a compression weight of not less than 400 g per carrier, said carrier being made by a process which comprises subjecting a nonwoven fabric having a specific gravity of not greater than 1.0 to a surface smoothing treatment at an elevated temperature of 200° to 450° C., then pressing with a roller to give a nonwoven fabric a thickness of 1 to 5 mm and a weight per unit area of 30 to 300 mg/cm 2 and then forming the nonwoven fabrics into a cylindrical hollow shape; said compression weight being measured by applying a spot weight to an upper part of the cylindrical hollow shaped carrier having an outer diameter of 50 mm and a length of 50 mm and gradually increasing the weight until the upper part is brought into contact with the lower part.
Claim 14
Dependent Claim
16 words
The carrier of claim 11, wherein the surface smoothing treatment temperature is 300° to 400° C.
Claim 15
Dependent Claim
17 words
The carrier of claim 12, wherein said thickness of the nonwoven fabric is 2 to 4 mm.
Claim 16
Dependent Claim
18 words
The carrier of claim 13, wherein said weight per unit area is 50 to 200 mg/cm 2 .
Claim 17
Dependent Claim
20 words
The carrier of claim 14, wherein said cylindrical hollow shape has an outer diameter of about 25 to 100 mm.
Claim 18
Dependent Claim
30 words
The carrier of claim 15, wherein said cylindrical hollow shape is longer than 100 mm and further comprising cutting said cylindrical hollow shape into cylinders of about 40-60 mm long.
Claim 19
Dependent Claim
17 words
The carrier of claim 16, wherein said thickness of the nonwoven fabric is 2 to 4 mm.
Claim 20
Dependent Claim
18 words
The carrier of claim 17, wherein said weight per unit area is 50 to 200 mg/cm 2 .
Claim 21
Dependent Claim
20 words
The carrier of claim 18, wherein said cylindrical hollow shape has an outer diameter of about 25 to 100 mm.
Claim 22
Dependent Claim
33 words
The carrier of claim 19, wherein said nonwoven fabric is formed of 35 to 90% of fibers of 50 to 600 denier and 10% to 65% of fibers of 20 to 1 denier.
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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) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |