Patent US3802157A successfully refreshed from Google Patents.
US4863565A
Expired / Lapsed
US
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Sheeted products formed from reticulated microbial cellulose
Assignee: Monsanto Co
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Filing: 1988-05-19
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Granted: 1989-09-05
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Expires: 2008-05-19
Abstract
Abstract A method and media for producing bacterial cellulose under agitated culture conditions resulting in sustained production over an average of 70 hours of at least 0.1 g/liter per hour are achieved. A unique reticulated cellulose product is produced using the methods and conditions claimed, and may be in the form of a sheet characterized by substantial resistance to densification and great tensile strength when produced by sheet forming means. Strains of Acetobacter that are stable under agitated culture conditions and that exhibit substantially reduced gluconic and keto-gluconic acids production are described.
Inventors
- 👤 Donald C. Johnson
- 👤 Amar N. Neogi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:56
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; C; C12; C12N; C12N1/00; C12N1/20; C12N1/205; C12P; C12P19/00; C12P19/04; C12R; C12R2001/00; C12R2001/01; C12R2001/02; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/823; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2933; Y10T428/2964; Y10T428/2965
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
54 words
A wet laid cellulosic sheet comprising a microbially produced cellulose under conditions of agitation, said cellulose being characterized by a high frequency of thickened branched substantially continuous cellulose strands that interconnect to form a reticulated grid-like structure extending in three dimensions, said sheet showing a high degree of resistance to densification by wet compression.
Claim 2
Dependent Claim
54 words
A wet laid cellulosic sheet comprising a microbially produced cellulose under conditions of agitation, said cellulose being characterized by a high frequency of thickened branched substantially continuous cellulose strands that interconnect to form a reticulated grid-like structure extending in three dimensions, said sheet showing a high degree of resistance to densification by wet compression.
Claim 3
Dependent Claim
17 words
The cellulosic sheet of claim 1 wherein said microbial cellulose is produced by fermentation under agitated conditions.
Claim 4
Dependent Claim
21 words
The cellulosic sheet of claim 1 wherein the microbial cellulose is produced by a cellulose producing organism of the genus Acetobacter.
Claim 5
Dependent Claim
22 words
The cellulosic sheet of claim 3 in which the Acetobacter organism is resistant to mutation in agitated culture to non-cellulose producing strains.
Claim 6
Dependent Claim
22 words
The cellulose sheet of claim 4 wherein the microbial cellulose is produced by a cellulose producing organism of the species Acetobacter xylinum.
Claim 7
Dependent Claim
30 words
The cellulosic sheet of claim 5 wherein said microorganism is selected from the group consisting of Acetobacter xylinium ATCC 53264, 53263, and 53254, corresponding to strains 1306-3, 1306-11, and 1306-21.
Claim 8
Dependent Claim
19 words
The cellulosic sheet of claim 1 wherein the sheet is formed from an aqueous suspension of the microbial cellulose.
Claim 9
Dependent Claim
29 words
The cellulosic sheet of claim 1 wherein the sheet has a tensile index of at least about 100 N-m/g at sheet densities as low as 300 kg/m 3 .
Claim 10
Dependent Claim
70 words
A wet laid resilient cellulosic sheet comprising a microbially produced cellulose produced by fermentation under under agitated conditions, said cellulose being characterized by a high frequency of thickened branched strands that interconnect to form a reticulated grid-like structure extending in three dimensions, said sheet showing a high degree of resiliency and resistance to densification by wet compression when compared with sheets formed from microbially produced cellulose fermented in static culture.
Claim 11
Dependent Claim
70 words
A wet laid resilient cellulosic sheet comprising a microbially produced cellulose produced by fermentation under under agitated conditions, said cellulose being characterized by a high frequency of thickened branched strands that interconnect to form a reticulated grid-like structure extending in three dimensions, said sheet showing a high degree of resiliency and resistance to densification by wet compression when compared with sheets formed from microbially produced cellulose fermented in static culture.
Claim 12
Dependent Claim
31 words
The cellulosic sheet of claim 9 wherein the microbial cellulose is produced by a cellulose producing organism of the genus Acetobacter resistant to mutation in agitated culture to non-cellulose producing strains.
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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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |