US3898326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinylpyrrolidone-iodide compositions and polyvinylpyrrolidone-iodide-iodine complexes prepared therefrom
Assignee: WEST LABORATORIES Inc
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Filing: 1973-05-14
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Granted: 1975-08-05
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Expires: 1993-05-14
Abstract
Abstract A unique PVP-iodide solid solution is prepared by drying a solution of PVP and iodide wherein the PVP:I ratio is preferably in the range of about 2:1 to 6:1, which dried product may then be mechanically blended with elemental iodine at ambient temperature to rapidly form a stabilized PVP-iodide-iodine complex, characterized in that the resulting product comprises a single solid phase.
Inventors
- 👤 Abraham Cantor
- 👤 Murray W Winicov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:32
CPC Classifications
A; A43; A43B; A43B3/00; A43B3/12; A43B3/128; C; C11; C11D; C11D1/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
62 words
THE SOLID PVP-IODIDE PRODUCT OBTAINED BY FIRST PREPARING AN AQUEOUS SOLUTION OF POLY(N-VINYL-2-PYRROLIDONE) AND A WATER SOLUBLE IODIDE SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM, LITHIUM, MAGNESIUM, HYDROGEN, CALCIUM, AMMONIUM, AMINE AND QUATERMARY AMMONIUM IODIDES IN PROPORTIONS TO PROVIDE A PVP:I- RATIO IN THE RANGE OF ABOUT 1:1 TO 20:1, AND DRYING SAID AQUEOUS SOLUTION TO FORM A PVPIODIDE SOLID SOLUTION.
Claim 2
Dependent Claim
62 words
THE SOLID PVP-IODIDE PRODUCT OBTAINED BY FIRST PREPARING AN AQUEOUS SOLUTION OF POLY(N-VINYL-2-PYRROLIDONE) AND A WATER SOLUBLE IODIDE SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM, LITHIUM, MAGNESIUM, HYDROGEN, CALCIUM, AMMONIUM, AMINE AND QUATERMARY AMMONIUM IODIDES IN PROPORTIONS TO PROVIDE A PVP:I- RATIO IN THE RANGE OF ABOUT 1:1 TO 20:1, AND DRYING SAID AQUEOUS SOLUTION TO FORM A PVPIODIDE SOLID SOLUTION.
Claim 3
Dependent Claim
15 words
The solid PVP-iodide product as defined in claim 1 in the form of a powder.
Claim 4
Dependent Claim
26 words
The PVP-iodide powder as defined in claim 2, wherein said powder contains an amount of moisture ranging from a trace to about 15 percent by weight.
Claim 5
Dependent Claim
70 words
The process for formulating PVP-iodide-iodine compositions that comprises mechanically blending the PVP-iodide solid solution as defined in claim 2 with elemental iodine at ambient temperature, to thereby obtain a single-phase solid in which the iodine is uniformly complexed with said PVP-iodide solid solution, the amount of iodine thus complexed with the PVP-iodide being in the range of a trace amount to an amount approximately equal to the weight of PVP.
Claim 6
Dependent Claim
28 words
The process as defined in claim 4, wherein the amount of combined iodine is such as to provide a PVP:iodine ratio within the range of 1:1 to 20:1.
Claim 7
Dependent Claim
44 words
The process as defined in claim 4, wherein the amount of combined iodine is such as to provide a PVP:iodine ratio within the range of 2:1 to 10:1 and a ratio of iodide (I ) to iodine in the range of 0.5:1 to 3:1.
References Cited (Backward Citations)
US2739922A
Cited
US2706701A
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US2826532A
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US2900305A
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US2853416A
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US3028300A
Cited
US3671545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |