US4091035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of hypoallergenic lanolin
Assignee: Woolcombers Ltd
•
Filing: 1977-01-24
•
Granted: 1978-05-23
•
Expires: 1997-01-24
Abstract
Abstract A process for the production of hypoallergenic lanolin by the reduction of free fatty acids and detergents by the use of a polar aliphatic alcohol such as methanol, ethanol, iso-propanol, acetone and acetic acid.
Inventors
- 👤 Edward Watson Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:33
CPC Classifications
C; C11; C11B; C11B11/00; C11B11/005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
41 words
A process for the production of hypoallergenic lanolin wherein lanolin is treated to reduce both the free fatty alcohol content to less than 3.0% and the detergent content to less than 0.05% while otherwise retaining the lanolin esters substantially chemically unchanged.
Claim 2
Dependent Claim
41 words
A process for the production of hypoallergenic lanolin wherein lanolin is treated to reduce both the free fatty alcohol content to less than 3.0% and the detergent content to less than 0.05% while otherwise retaining the lanolin esters substantially chemically unchanged.
Claim 3
Dependent Claim
37 words
A process for the production of hypoallergenic lanolin as in claim 1 comprising the treatment of lanolin with vacuum at an absolute pressure of 20 to 150 millitorrs and a temperature of 180° C to 240° C.
Claim 4
Dependent Claim
70 words
A process for the production of hypoallergenic lanolin wherein lanolin is treated with a polar solvent under controlled conditions of pressure and temperature to simultaneously reduce the free fatty alcohol content to less than 3.0% and the detergent content to less than 0.05%, said polar solvent being a material or mixture of materials selected from the group consisting of methanol, ethanol, industrial methylated spirits, iso-propanol, n-propanol, acetone and acetic acid.
Claim 5
Dependent Claim
70 words
A process for the production of hypoallergenic lanolin wherein lanolin is treated with a polar solvent under controlled conditions of pressure and temperature to simultaneously reduce the free fatty alcohol content to less than 3.0% and the detergent content to less than 0.05%, said polar solvent being a material or mixture of materials selected from the group consisting of methanol, ethanol, industrial methylated spirits, iso-propanol, n-propanol, acetone and acetic acid.
Claim 6
Dependent Claim
41 words
A process as claimed in claim 3 in which the lanolin to be treated is dissolved in a substantially non-polar solvent selected from the group consisting of hexane, heptane and a hydrocarbon solvent of boiling range between 40° and 100° C.
Claim 7
Dependent Claim
18 words
A process according to claim 3 in which the temperature during treatment is from 40° to 80° C.
Claim 8
Dependent Claim
18 words
A process according to claim 3 in which the temperature during treatment is from 10° to 50° C.
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) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |