US3329574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and material for selective diffusion
Assignee: SCHWARZ BIORES Inc
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Filing: 1965-04-12
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Granted: 1967-07-04
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Expires: 1985-04-12
Abstract
No abstract record available.
Inventors
- 👤 Lawrence E Barron
- 👤 Andrew G Tsuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:57
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2063; A61K9/28; A61K9/2806; A61K9/2833; A61K9/2873; A61K9/48; A61K9/4816; A61K9/4825; A61K9/70; A61K9/7007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A METHOD FOR THE CONTROLLED ADMIXING OF AN ACTIVE MATERIAL SELECTED FROM THE GROUP CONSISTING OF WATERSOLUBLE SUBSTANCES AND WATER-MISCIBLE SUBSTANCES WITH AN AQUEOUS MEDIUM WHICH COMPRISES; ISOLATING SAID ACTIVE MATERIAL WITH A BARRIER OF HIGH BLOOM CROSS-LINKED THIOLATED GELATIN, SAID GELATIN HAVING DISULFIDE CROSS LINKS FROMED BY THE OXIDATIVE UNION OF FROM 2 TO 25 FREE THIO GROUPS PER MOLE OF GELATIN AND SAID GELATIN BEING SELECTIVELY IMPERMEABLE TO SAID ACTIVE MATERIAL AND PERMEABLE TO SAID AQUEOUS MEDIUM; AND EXPOSING SAID GELATIN BARRIER TO SAID AQUEOUS MEDIUM WHEREBY SAID MEDIUM IS DIFFUSED THROUGH THE MOLECULAR STRUCTURE OF SAID BARRIER AT A CONTROLLED RATE AND INTO INTIMATE ADMIXTURE WITH SAID ACTIVE MATERIAL.
Claim 2
Independent Claim
112 words
A METHOD FOR THE CONTROLLED ADMIXING OF AN ACTIVE MATERIAL SELECTED FROM THE GROUP CONSISTING OF WATERSOLUBLE SUBSTANCES AND WATER-MISCIBLE SUBSTANCES WITH AN AQUEOUS MEDIUM WHICH COMPRISES; ISOLATING SAID ACTIVE MATERIAL WITH A BARRIER OF HIGH BLOOM CROSS-LINKED THIOLATED GELATIN, SAID GELATIN HAVING DISULFIDE CROSS LINKS FROMED BY THE OXIDATIVE UNION OF FROM 2 TO 25 FREE THIO GROUPS PER MOLE OF GELATIN AND SAID GELATIN BEING SELECTIVELY IMPERMEABLE TO SAID ACTIVE MATERIAL AND PERMEABLE TO SAID AQUEOUS MEDIUM; AND EXPOSING SAID GELATIN BARRIER TO SAID AQUEOUS MEDIUM WHEREBY SAID MEDIUM IS DIFFUSED THROUGH THE MOLECULAR STRUCTURE OF SAID BARRIER AT A CONTROLLED RATE AND INTO INTIMATE ADMIXTURE WITH SAID ACTIVE MATERIAL.
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) | 1970-07-03 | 1971-01-02 | 1971-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-03 | 1975-01-02 | 1975-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-03 | 1979-01-02 | 1979-07-04 | $7700.00 | Window Closed / Lapsed |