Patent US3673227A successfully refreshed from Google Patents.
US3673227A
Expired / Lapsed
US
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Simplified continuous rendering system
Assignee: Duke Inc
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Filing: 1970-01-12
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Granted: 1972-06-27
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Expires: 1990-01-12
Abstract
Abstract A continuous process for the dry rendering of raw materials in the form of animal, poultry and fish byproducts to produce fat and tankage in which the raw materials are cooked to free the fats therefrom in a single cooking operation, the raw materials being reduced to a mean particle size and then cooked under controlled moisture and temperature conditions and maintained in the cooking vessel for a residence time at least equal to one hour flow rate of the materials through the cooker.
Inventors
- 👤 Jack G Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:55
CPC Classifications
C; C11; C11B; C11B1/00; C11B1/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
37 words
The process claimed in claim 1 wherein the raw materials are reduced to a mean particle size of approximately one-half inch cubes, the raw materials being introduced into the cooker in the form of a slurry-like mass.
Claim 2
Dependent Claim
60 words
The process claimed in claim 1 wherein the cooked material is withdrawn from the vessel at a variable rate of flow correlated to the temperature of the cooking materials at the discharge end of the vessel, the rate of withdrawal being increased as the temperature of the cooking materials rises, and decreased as the temperature of the cooking materials falls.
Claim 3
Dependent Claim
62 words
The process claimed in claim 3 wherein the raw materials are intermittently fed to the cooking vessel, the feeding of the raw materials being correlated to the rate at which the cooked material is withdrawn from the vessel, the volume of raw materials introduced into the vessel being increased upon increase in the rate of withdrawal of cooked material from the vessel.
Claim 4
Dependent Claim
44 words
The process claimed in claim 1 including the step of cooking the raw materials by selectively varying the amount of heat applied to the material cooking in the leading and trailing ends of the vessel, whereby to assist in maintaining the temperature gradient therebetween.
Claim 5
Dependent Claim
54 words
The process claimed in claim 1 wherein the step of maintaining the materials in the vessel for a residence time at least equal to one hour flow rate of the material being processed includes the step of controlling the flow of the raw materials from the leading to the trailing end of the vessel.
Claim 6
Dependent Claim
47 words
The process claimed in claim 6 wherein the flow of materials from the leading to the trailing end of thE vessel is controlled by internally partitioning the vessel into the plurality of side-by-side chambers, and restricting the flow of raw materials from one chamber to the next.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |