US5215757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated materials
Assignee: Procter and Gamble Co
•
Filing: 1991-03-22
•
Granted: 1993-06-01
•
Expires: 2011-03-22
Abstract
Abstract This invention relates to polymeric liquid crystals prepared from a polysaccharide and a solvent, preferably water, which are used to deliver nutrients, perfumes, flavors, drugs and other ingredients in foods, cosmetics, household soaps, health care products e.g. bar or liquid soaps, toothpaste, shampoos, creams, and lotions and other preparations. The encapsulated active vehicle comprises: (a) from about 0.001% to about 60% of an active; and (b) from about 40% to about 99.999% of a stable polymeric liquid crystal consisting essentially of: (1) from about 10% to about 90% of a solvent; and (2) from about 10% to about 90% of a polysaccharide having a molecular weight of from about 500 to about 1,000,000.
Inventors
- 👤 Magda El-Nokaly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:02
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/02; A61K8/0295; A23; A23L; A23L27/00; A23L27/70; A23L27/72; A61K8/18; A61K8/72; A61K8/73; A61K8/731; A61K8/736; A61K9/00; A61K9/10; A61K9/127; A61K9/1274; A61Q; A61Q11/00; C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3804; C09K19/3819; C09K19/52; C09K19/54; C09K19/542; C09K19/544
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
An encapsulated active vehicle comprising: (a) from about 0.001% to about 60% of a non-lipid active; and (b) from about 40% to about 99.999% of a stable polymeric liquid crystal consisting essentially of: (1) from about 10% to about 90% of a solvent; and (2) from about 10% to about 90% of a polysaccharide having a molecular weight of from about 500 to about 1,000,000; said active being free of fats, oils, synthetic fats and mixtures thereof.
Claim 2
Dependent Claim
77 words
An encapsulated active vehicle comprising: (a) from about 0.001% to about 60% of a non-lipid active; and (b) from about 40% to about 99.999% of a stable polymeric liquid crystal consisting essentially of: (1) from about 10% to about 90% of a solvent; and (2) from about 10% to about 90% of a polysaccharide having a molecular weight of from about 500 to about 1,000,000; said active being free of fats, oils, synthetic fats and mixtures thereof.
Claim 3
Dependent Claim
13 words
A vehicle according to claim 1 wherein said solvent is a polar solvent.
Claim 4
Dependent Claim
21 words
A vehicle according to claim 2 wherein said active is selected from a group consisting of drugs, sunscreen, vitamins and minerals.
Claim 5
Dependent Claim
19 words
A vehicle according to claim 3 wherein said solvent is selected from the group consisting of water and alcohols.
Claim 6
Dependent Claim
20 words
A vehicle according to claim 4 wherein said polysaccharide has a molecular weight of from about 2500 to about 1,000,000.
Claim 7
Dependent Claim
25 words
A vehicle according to claim 3 wherein said polysaccharide is selected from the group consisting of substituted cellulose, cellulose-derivative polymers, gums, hydrocolloids and polyglucose materials.
Claim 8
Dependent Claim
26 words
A vehicle according to claim 1 wherein said solvent is selected from the group consisting of alcohol or glycol mixtures of flavor oils and perfume oils.
Claim 9
Dependent Claim
46 words
A vehicle according to claim 6 wherein said polysaccharide is selected from the group consisting of methyl cellulose, ethyl cellulose, ethyl hydroxyethyl cellulose, hydroxypropyl cellulose, sodium carboxymethyl cellulose, hydroxypropylmethyl cellulose, ethylmethyl cellulose, guar gum derivatives, xanthan gum, psyllium gum, alginate, locust bean gum and mixtures thereof.
Claim 10
Dependent Claim
25 words
A vehicle according to claim 8 wherein said polysaccharide is selected from the group consisting of methyl cellulose, hydroxypropyl cellulose, xanthan, alginates, and mixtures thereof.
References Cited (Backward Citations)
US3529156A
Cited
US3576761A
Cited
GB1346756A
Cited
US3998860A
Cited
JPS5382505A
Cited
JPS546883A
Cited
US4226890A
Cited
JPS559655A
Cited
JPS5632342A
Cited
JPS56109966A
Cited
US4301023A
Cited
US4378381A
Cited
JPS57147576A
Cited
JPS5972173A
Cited
JPS5972174A
Cited
JPS59181680A
Cited
JPS61281182A
Cited
JPS6239686A
Cited
JPS6455311A
Cited
US4999348A
Cited
US4981709A
Cited
US5106644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-31 | 1996-11-30 | 1997-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-31 | 2000-11-30 | 2001-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-31 | 2004-11-30 | 2005-06-01 | $7700.00 | Window Closed / Lapsed |