Patent US2681319A successfully refreshed from Google Patents.
US2681319A
Expired / Lapsed
US
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Permselective films of anionexchange resins
Assignee: Rohm and Haas Co
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Filing: 1951-01-10
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Granted: 1954-06-15
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Expires: 1971-01-10
Abstract
No abstract record available.
Inventors
- 👤 George W Bodamer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:25
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2275; C08J2323/00; C08J2323/02; C08J2323/04; C08J2325/00; C08J2325/02; C08J2325/04; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A PERMSELECTIVE, ANIONIC PELLICLE COMPRISING DISCRETE PARTICLES OF AN INSOLUBLE, INFUSIBLE ANIONEXCHANGE RESIN DISPERSED INTIMATELY AND UNIFORMLY THROUGHOUT A MATRIX WHICH IS A POLYMERIC MATERIAL FROM THE CLASS CONSISTING OF SOLID POLYETHYLENE, POLYISOBUTYLENE, VULCANIZED NATURAL RUBBER, VULCANIZED RUBBERY HOMOPOLYMERS OF BUTADIENE-1,3, VULCANIZED RUBBERY SYNTHETIC POLYMERS OF METHYL-2-BUTADIENE-1,3, VULCANIZED RUBBERY POLYMERS OF CHLORO-2-BUTADIENE-1,3, VULCANIZED RUBBERY COPOLYMERS OF BUTADIENE-1,3 AND STYRENE, VULCANIZED RUBBERY COPOLYMERS OF BUTADIENE-1,3 AND ACRYLONITRILE, POLYVINYLCHLORIDE, AND COPOLYMERS OF VINYLCHLORIDE AND VINYL ESTERS OF LOWER FATTY ACIDS, SAID PARTICLES BEING OF SUCH A SIZE AS TO PASS THROUGH A U. S. STANDARD SIEVE NO. 50 AND BEING PRESENT IN AN AMOUNT EQUAL TO 25% TO ABOUT 75% OF THE TOTAL DRY WEIGHT OF SAID PELLICLE.
Claim 2
Dependent Claim
116 words
A PERMSELECTIVE, ANIONIC PELLICLE COMPRISING DISCRETE PARTICLES OF AN INSOLUBLE, INFUSIBLE ANIONEXCHANGE RESIN DISPERSED INTIMATELY AND UNIFORMLY THROUGHOUT A MATRIX WHICH IS A POLYMERIC MATERIAL FROM THE CLASS CONSISTING OF SOLID POLYETHYLENE, POLYISOBUTYLENE, VULCANIZED NATURAL RUBBER, VULCANIZED RUBBERY HOMOPOLYMERS OF BUTADIENE-1,3, VULCANIZED RUBBERY SYNTHETIC POLYMERS OF METHYL-2-BUTADIENE-1,3, VULCANIZED RUBBERY POLYMERS OF CHLORO-2-BUTADIENE-1,3, VULCANIZED RUBBERY COPOLYMERS OF BUTADIENE-1,3 AND STYRENE, VULCANIZED RUBBERY COPOLYMERS OF BUTADIENE-1,3 AND ACRYLONITRILE, POLYVINYLCHLORIDE, AND COPOLYMERS OF VINYLCHLORIDE AND VINYL ESTERS OF LOWER FATTY ACIDS, SAID PARTICLES BEING OF SUCH A SIZE AS TO PASS THROUGH A U. S. STANDARD SIEVE NO. 50 AND BEING PRESENT IN AN AMOUNT EQUAL TO 25% TO ABOUT 75% OF THE TOTAL DRY WEIGHT OF SAID PELLICLE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |