Patent US5167854A successfully refreshed from Google Patents.
US5167854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated enzyme in dry bleach composition
Assignee: Clorox Co
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Filing: 1989-09-01
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Granted: 1992-12-01
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Expires: 2009-09-01
Abstract
Abstract The invention relates to a bleaching composition containing an oxidant bleach and enzyme granules, in which enzyme stability is prolonged without undue loss of solubility despite intimate contact of said enzyme granules and said oxidant bleach, comprising: an oxidant bleach, selected from the group consisting of alkali-metal peroborates, alkali metal percarbonates, hydrogen peroxide adducts, and mixtures thereof and hydrolase enzyme granules comprising a hydrolase enzyme core and a water soluble alkali metal silicate coating substantially encapsulating said core, said coating including at least one protective agent, said agent being selected from the group consisting of transition metals; reducing agents; and mixtures thereof. Sodium percarbonate is a preferred oxidant, while transition metals combined with a sodium silicate coating provide enhanced storage stability to the enzymes thereby coated.
Inventors
- 👤 David L. Deleeuw
- 👤 Dale S. Steichen
- 👤 James D. Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:34
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D17/00; C11D17/0039; C11D17/04; C11D17/041; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3761; C11D3/38; C11D3/386; C11D3/38672; C11D3/39; C11D3/3902; C11D3/3937; C11D3/3942; C11D3/3945; C11D3/40; C11D3/42; C11D3/50; C11D3/502; C11D3/505
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
A bleaching composition containing an oxidant bleach and enzyme granules, in which enzyme stability is prolonged without undue loss of solubility despite intimate contact of said enzyme granules and said oxidant bleach, comprising: An oxidant bleach selected from the group consisting of alkali metal perborates, alkali metal percarbonates, hydrogen peroxide adducts, and mixtures thereof; and hydrolase enzyme granules comprising a hydrolase enzyme core with a water soluble alkali metal silicate coating substantially encapsulating said core, said coating including at least one protective agent, said agent being selected from the group consisting of transition metals; reducing agents; and mixtures thereof.
Claim 2
Dependent Claim
99 words
A bleaching composition containing an oxidant bleach and enzyme granules, in which enzyme stability is prolonged without undue loss of solubility despite intimate contact of said enzyme granules and said oxidant bleach, comprising: An oxidant bleach selected from the group consisting of alkali metal perborates, alkali metal percarbonates, hydrogen peroxide adducts, and mixtures thereof; and hydrolase enzyme granules comprising a hydrolase enzyme core with a water soluble alkali metal silicate coating substantially encapsulating said core, said coating including at least one protective agent, said agent being selected from the group consisting of transition metals; reducing agents; and mixtures thereof.
Claim 3
Dependent Claim
12 words
The bleaching composition of claim 1 wherein said oxidant is sodium percarbonate.
Claim 4
Dependent Claim
23 words
The bleaching composition of claim 1 wherein said hydrolase is selected from the group consisting of proteases, amylases, lipases, cellulases, and mixtures thereof.
Claim 5
Dependent Claim
11 words
The bleaching composition of claim 3 wherein said hydrolase is protease.
Claim 6
Dependent Claim
14 words
The bleaching composition of claim 1 wherein said protective agent comprises transition metal salts.
Claim 7
Dependent Claim
22 words
The bleaching composition of claim 5 wherein said transition metal salts are chosen from copper, nickel, iron, cobalt salts, and mixtures thereof.
Claim 8
Dependent Claim
15 words
The bleaching composition of claim 1 wherein said coating further comprises an alkali metal carbonate.
Claim 9
Dependent Claim
86 words
A dry granular oxidant bleach and enzyme composition which has enhanced enzyme stability, despite prolonged storage in the presence of said oxidant bleach, and improved enzyme solubility in aqueous media, said bleach composition comprising: a) An oxidant selected form the group consisting of alkali metal perborates, alkali metal percarbonates, hydrogen peroxide adducts, and mixtures thereof; b) A hydrolase which is coated substantially completely by an alkali metal silicate and an additive which is selected from the group consisting of reducing agents, transition metals, and mixtures thereof.
Claim 10
Dependent Claim
86 words
A dry granular oxidant bleach and enzyme composition which has enhanced enzyme stability, despite prolonged storage in the presence of said oxidant bleach, and improved enzyme solubility in aqueous media, said bleach composition comprising: a) An oxidant selected form the group consisting of alkali metal perborates, alkali metal percarbonates, hydrogen peroxide adducts, and mixtures thereof; b) A hydrolase which is coated substantially completely by an alkali metal silicate and an additive which is selected from the group consisting of reducing agents, transition metals, and mixtures thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-01 | 1996-06-01 | 1996-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-01 | 2000-06-01 | 2000-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-01 | 2004-06-01 | 2004-12-01 | $7700.00 | Window Closed / Lapsed |