US4784769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma polymerized acetonitrile protective coatings and method of preparation therefor for ultrafiltration/microfiltration membranes
Assignee: Standard Oil Co
•
Filing: 1986-11-21
•
Granted: 1988-11-15
•
Expires: 2006-11-21
Abstract
Abstract The present invention relates to a process for coating an ultrafiltration/microfiltration membrane with a thin protective thin film comprising: (a) loading the ultrafiltration/microfiltration membrane in an enclosed reactor; (b) evacuating the reactor; (c) charging the reactor with an inert carrier gas and a gaseous nitrogen-containing organic monomer; and (d) plasma-polymerizing the organic monomer such that a thin-film protective coating of the polymerized monomer is deposited on the entire effective surface of the membrane. The present invention further relates to a nonfouling membrane comprising an ultrafiltration/microfiltration membrane substrate on which is deposited an anti-fouling polymerized nitrogen-containing organic monomer thin film protective coating.
Inventors
- 👤 Paul J. Giordano, Jr.
- 👤 Richard C. Smierciak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:41
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/62; B01; B01D; B01D69/00; B01D69/12; B01D69/125; B01D69/127
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
A process for coating an ultrafiltration/microfiltration membrane with a protective thin film comprising: (a) loading said ultrafiltration/microfiltration membrane in an enclosed reactor; (b) evacuating said reactor; (c) charging said reactor with an inert carrier gas and gaseous acetonitrile monomer; (d) plasma-polymerizing said organic monomer such that a thin-film protective coating of said polymerized monomer is deposited on the entire effective surface of said membrane.
Claim 2
Dependent Claim
64 words
A process for coating an ultrafiltration/microfiltration membrane with a protective thin film comprising: (a) loading said ultrafiltration/microfiltration membrane in an enclosed reactor; (b) evacuating said reactor; (c) charging said reactor with an inert carrier gas and gaseous acetonitrile monomer; (d) plasma-polymerizing said organic monomer such that a thin-film protective coating of said polymerized monomer is deposited on the entire effective surface of said membrane.
Claim 3
Dependent Claim
13 words
The process as in claim 1 wherein said membrane is a polysulfone membrane.
Claim 4
Dependent Claim
25 words
The process as in claim 1 wherein said thin film protective coating is deposited to a thickness of between about 100 to about 500 Angstroms.
Claim 5
Dependent Claim
23 words
The process as in claim 3 wherein said thin film protective coating is deposited to a thickness of between 100 and 300 Angstroms.
Claim 6
Dependent Claim
21 words
A nonfouling membrane comprising an ultrafiltration/microfiltration membrane surface on which is deposited an anti-fouling polymerized acetonitrile monomer thin film protective coating.
Claim 7
Dependent Claim
21 words
A nonfouling membrane comprising an ultrafiltration/microfiltration membrane surface on which is deposited an anti-fouling polymerized acetonitrile monomer thin film protective coating.
Claim 8
Dependent Claim
21 words
The membrane as in claim 5 wherein said thin film protective coating is between about 100 and about 500 Angstroms thick.
Claim 9
Dependent Claim
21 words
The membrane as in claim 6 wherein said thin film protective coating is between about 100 and about 300 Angstroms thick.
Claim 10
Dependent Claim
15 words
The membrane as in claim 5 wherein said ultrafiltration/microfiltration membrane substrate is a polysulfone membrane.
References Cited (Backward Citations)
US3657113A
Cited
US3775308A
Cited
US3847652A
Cited
US4032440A
Cited
US4100113A
Cited
US4199448A
Cited
US4252848A
Cited
US4188426A
Cited
US4618533A
Cited
JPH116286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |