US4039499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Product
Assignee: Standard Oil Co
•
Filing: 1975-06-25
•
Granted: 1977-08-02
•
Expires: 1995-06-25
Abstract
Abstract Hollow membrane fibers are formed from a mixture of N-alkoxyalkyl polyamide, polyvinyl alcohol, di(lower alkyl) sulfoxide and water. The fibers are useful for separating chemicals, e.g., aliphatically-unsaturated hydrocarbons, from mixtures containing them.
Inventors
- 👤 Edward F. Steigelmann
- 👤 Robert D. Hughes
- 👤 Joseph Gabor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:31
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24; B; B01; B01D; B01D69/00; B01D69/08; B01D71/00; B01D71/06; B01D71/56; C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/097; C08K; C08K5/00; C08K5/36; C08K5/41; C08L; C08L29/00; C08L29/02; C08L29/04; C08L77/00; Y; Y10; Y10S; Y10S524/00; Y10S524/909; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
56 words
A composition consisting essentially of hydrophilic polymer and di(lower alkyl) sulfoxide solvent, said polymer consisting essentially of film-forming N-alkoxyalkyl nylon and sufficient water-soluble polyvinyl alcohol to enhance the hydrophilic properties of the nylon, said composition having a sufficient amount of water to inhibit degradation of the polymer at elevated temperatures suitable for extrusion of the composition.
Claim 2
Dependent Claim
56 words
A composition consisting essentially of hydrophilic polymer and di(lower alkyl) sulfoxide solvent, said polymer consisting essentially of film-forming N-alkoxyalkyl nylon and sufficient water-soluble polyvinyl alcohol to enhance the hydrophilic properties of the nylon, said composition having a sufficient amount of water to inhibit degradation of the polymer at elevated temperatures suitable for extrusion of the composition.
Claim 3
Dependent Claim
14 words
The composition of claim 1 in which the di(lower alkyl) sulfoxide is dimethyl sulfoxide.
Claim 4
Dependent Claim
32 words
The composition of claim 2 in which the polymer has about 30 to 85 weight % of said nylon and about 15 to 70 weight % polyvinyl alcohol based on their total.
Claim 5
Dependent Claim
25 words
The composition of claim 3 in which the dimethyl sulfoxide is about 70 to 400 weight % based on the total polyamide and polyvinyl alcohol.
Claim 6
Dependent Claim
13 words
The composition of claim 1 in which the nylon is an N-methoxymethyl nylon.
Claim 7
Dependent Claim
32 words
The composition of claim 5 in which the polymer has about 40 to 70 weight % of said nylon and about 30 to 60 weight % polyvinyl alcohol based on their total.
Claim 8
Dependent Claim
26 words
The composition of claim 6 in which the di(lower alkyl) sulfoxide is about 90 to 250 weight % based on the total nylon and polyvinyl alcohol.
Claim 9
Dependent Claim
14 words
The composition of claim 7 in which the di(lower alkyl) sulfoxide is dimethyl sulfoxide.
Claim 10
Dependent Claim
27 words
The composition of claim 8 in which the water is about 1 to 30 weight % based on the total weight of the dimethyl sulfoxide and water.
Claim 11
Dependent Claim
76 words
An extrusible composition consisting essentially of polymer consisting essentially of about 30 to 85 weight % of N-alkoxyalkyl nylon and about 15 to 70 weight % of water-soluble polyvinyl alcohol based on their total, about 70 to 400 weight % of di(lower alkyl) sulfoxide based on the total weight of the nylon and polyvinyl alcohol, and about 1 to 30 weight % of water based on the total weight of the water and di(lower alkyl) sulfoxide.
Claim 12
Dependent Claim
76 words
An extrusible composition consisting essentially of polymer consisting essentially of about 30 to 85 weight % of N-alkoxyalkyl nylon and about 15 to 70 weight % of water-soluble polyvinyl alcohol based on their total, about 70 to 400 weight % of di(lower alkyl) sulfoxide based on the total weight of the nylon and polyvinyl alcohol, and about 1 to 30 weight % of water based on the total weight of the water and di(lower alkyl) sulfoxide.
Claim 13
Dependent Claim
30 words
The composition of claim 10 in which the polymer has about 40 to 70 weight % nylon and about 30 to 60 weight % polyvinyl alcohol based on their total.
Claim 14
Dependent Claim
49 words
The composition of claim 11 in which there is about 90 to 250 weight % di(lower alkyl) sulfoxide based on the total weight of the nylon and polyvinyl alcohol, and about 2 to 20 weight % water based on the total weight of the water and di(lower alkyl) sulfoxide.
Claim 15
Dependent Claim
13 words
The composition of claim 12 in which the nylon is an N-methoxymethyl nylon.
Claim 16
Dependent Claim
14 words
The composition of claim 13 in which the di(lower alkyl) sulfoxide is dimethyl sulfoxide.
Claim 17
Dependent Claim
69 words
A composition consisting essentially of hydrophilic polymer and di(lower alkyl) sulfoxide solvent, said polymer consisting essentially of film-forming N-alkoxyalkyl nylon having about 5 to 60% of the amide groups substituted with alkoxyalkyl groups and sufficient water-soluble polyvinyl alcohol to enhance the hydrophilic properties of the nylon, said composition having a sufficient amount of water to inhibit degradation of the polymer at elevated temperatures suitable for extrusion of the composition.
Claim 18
Dependent Claim
69 words
A composition consisting essentially of hydrophilic polymer and di(lower alkyl) sulfoxide solvent, said polymer consisting essentially of film-forming N-alkoxyalkyl nylon having about 5 to 60% of the amide groups substituted with alkoxyalkyl groups and sufficient water-soluble polyvinyl alcohol to enhance the hydrophilic properties of the nylon, said composition having a sufficient amount of water to inhibit degradation of the polymer at elevated temperatures suitable for extrusion of the composition.
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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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |