US4151306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for hydrolyzing proteinaceous derivatives of the skin
Assignee: VD ANDERSON COMPANY
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Filing: 1977-11-25
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Granted: 1979-04-24
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Expires: 1997-11-25
Abstract
Abstract A process for hydrolyzing keratinous materials, comprising the steps of mechanically dewatering raw keratinous material to reduce the water content while maintaining the water in its liquid phase, applying heat and pressure to the dewatered material to hydrolyze the material, and drying the material. Also disclosed is the product produced by the foregoing process.
Inventors
- 👤 Maurice A. Williams
- 👤 Robert E. Horn
- 👤 John C. Bronikowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:30
CPC Classifications
C; C08; C08H; C08H1/00; C08H1/06; A; A23; A23J; A23J1/00; A23J1/10; Y; Y10; Y10S; Y10S530/00; Y10S530/827; Y10S530/842
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
A process for treating raw keratinous materials, said process comprising the steps of mechanically dewatering raw keratinous materials to reduce the moisture contents of the materials to a level sufficient to support the subsequent hydrolyzing step without excess moisture; high shear extruding the keratinous materials to hydrolyze the protein while retaining the moisture in the materials during extruding by exerting a mechanical pressure on the materials is excess of the vapor pressure of the moisture in the materials; and drying the material.
Claim 2
Dependent Claim
82 words
A process for treating raw keratinous materials, said process comprising the steps of mechanically dewatering raw keratinous materials to reduce the moisture contents of the materials to a level sufficient to support the subsequent hydrolyzing step without excess moisture; high shear extruding the keratinous materials to hydrolyze the protein while retaining the moisture in the materials during extruding by exerting a mechanical pressure on the materials is excess of the vapor pressure of the moisture in the materials; and drying the material.
Claim 3
Dependent Claim
42 words
The invention according to claim 1 wherein the step of high shear extruding raw keratinous materials comprises treating the keratinous material in a screw press to establish a moisture content of 30 to 40% by weight of the entire dewatered keratinous material.
Claim 4
Dependent Claim
44 words
The invention according to claim 1 and further comprising the step of elevating the moisture content of the raw keratinous materials in the event the moisture content of the raw materials is less than the moisture content needed to support the subsequent hydrolyzing step.
Claim 5
Dependent Claim
30 words
The invention according to claim 3 wherein the step of elevating the moisture of the keratinous material comprises the injecting moisture into the keratinous materials during the mechanical working step.
Claim 6
Dependent Claim
43 words
The invention according to claim 1 wherein the step of high shear extruding the keratinous materials comprises continuously feeding the keratinous material into an extruding apparatus and applying extrusion pressure into such material for a sufficient period of time to hydrolyze the material.
Claim 7
Dependent Claim
35 words
The invention according to claim 5 wherein said extrusion pressure is in the range of 200 to 1500 psi to establish a moisture content in the keratinous materials of from 20 to 45% by weight.
Claim 8
Dependent Claim
80 words
The invention according to claim 1 wherein: the step of mechanically dewatering the raw keratinous materials comprises dewatering the materials to establish a moisture content in the range of 35 to 40%; and the step of high shear extruding the keratinous materials comprises extruding at a pressure in the range of 500 psi to 700 psi, at a temperature in the range of 250° F. to 400° F., for an extrusion period in the range of 20 to 30 seconds.
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) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |