Patent US3930000A successfully refreshed from Google Patents.
US3930000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver-zinc allantoinate compositions and method of killing bacteria and fungi therewith
Assignee: University of Washington
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Filing: 1974-05-09
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Granted: 1975-12-30
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Expires: 1994-05-09
Abstract
Abstract A silver zinc allantoinate composition and method for making it. The silver zinc allantoinate is prepared by a novel process producing high yields above 90 percent and the resultant silver zinc allantoinate has a low water solubility of about 0.02 percent at 25* C. providing for slow release of silver and zinc ions in medication. The silver zinc allantoinate can be incorporated into various carriers such as ointment, creams, lotions, aerosol sprays, and the like, for topical application for control of bacteria and fungi.
Inventors
- 👤 Harry W Margraf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:31
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/88; A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/41; Y; Y10; Y10S; Y10S424/00; Y10S424/13
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
28 words
A METHOD OF KILLING BACTERIA AND FUNGI IN AN INFECTED AREA COMPRISING TOPICALLY APPLYING TO THE INFECTED AREA AN EFFECTED AMOUNT OF SILVER-ZINC-ALLANTOINATE OF THE FORMULA (C4H5O3N4AG)2 :ZN(OH)2.
Claim 2
Independent Claim
28 words
A METHOD OF KILLING BACTERIA AND FUNGI IN AN INFECTED AREA COMPRISING TOPICALLY APPLYING TO THE INFECTED AREA AN EFFECTED AMOUNT OF SILVER-ZINC-ALLANTOINATE OF THE FORMULA (C4H5O3N4AG)2 :ZN(OH)2.
Claim 3
Dependent Claim
16 words
The method of claim 1 in which the topical application is to a skin burn area.
Claim 4
Dependent Claim
15 words
The method of claim 1 in which the silver-zinc-allantoinate is suspended in an inert carrier.
Claim 5
Dependent Claim
13 words
The method of claim 1 in which the carrier also contains free allantoin.
Claim 6
Dependent Claim
20 words
A pharmaceutical composition comprising a bacteriostatically effective amount of silver-zinc-allantoinate of the formula (C4H5O3N4Ag)2 : Zn(OH)2 in a pharmaceutical carrier.
Claim 7
Dependent Claim
20 words
A pharmaceutical composition comprising a bacteriostatically effective amount of silver-zinc-allantoinate of the formula (C4H5O3N4Ag)2 : Zn(OH)2 in a pharmaceutical carrier.
Claim 8
Dependent Claim
23 words
The composition of claim 5 in which silver-zinc-allantoinate is present in an amount of 0.3 to 3 grams per 100 grams of carrier.
Claim 9
Dependent Claim
26 words
A pharmaceutical composition comprising a bacteriostatically effective amount of silver-zinc-allantoinate of the formula (C4H5O3N4Ag)2 : Zn(OH)2 incorporated as a powder in a water-soluble pharmaceutical ointment base.
Claim 10
Dependent Claim
26 words
A pharmaceutical composition comprising a bacteriostatically effective amount of silver-zinc-allantoinate of the formula (C4H5O3N4Ag)2 : Zn(OH)2 incorporated as a powder in a water-soluble pharmaceutical ointment base.
Claim 11
Dependent Claim
9 words
The composition of claim 7 also including free alLantoin.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |