US3959504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Peeling root vegetables with NaOH and hot gas treatment
Assignee: Svenska Foodco AB
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Filing: 1973-09-21
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Granted: 1976-05-25
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Expires: 1993-09-21
Abstract
Abstract A method of peeling root vegetables by dipping the vegetables into hot aqueous sodium hydroxide, and drying them at 100°-150°C for 2-5 minutes by intense application of a drying gas, such as hot air or superheated steam, whereupon the root vegetables are allowed to rest for 3-10 minutes at ambient temperature.
Inventors
- 👤 Sven-Gunnar Henrik Grufstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:43
CPC Classifications
A; A23; A23N; A23N7/00; A23N7/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
In a method of peeling root vegetables by treating unpeeled root vegetables during 0.5 to 1 minute with 12-25% aqueous sodium hydroxide at a temperature of about 60°-90°C, followed by heat treatment and then peeling, the improvement wherein said heat treatment comprises (1) drying said root vegetables by means of a drying, hot gas stream of hot air or superheated steam applied at a rate of 1-5 meters per second for 2-5 minutes at a temperature of 100°-150°C to increase and hold the sodium hydroxide concentration on the root vegetable skin at approximately 20-30%, and (2) then withdrawing application of the hot gas stream and maintaining said root vegetables without supplying or removing heat for 3-10 minutes.
Claim 2
Dependent Claim
117 words
In a method of peeling root vegetables by treating unpeeled root vegetables during 0.5 to 1 minute with 12-25% aqueous sodium hydroxide at a temperature of about 60°-90°C, followed by heat treatment and then peeling, the improvement wherein said heat treatment comprises (1) drying said root vegetables by means of a drying, hot gas stream of hot air or superheated steam applied at a rate of 1-5 meters per second for 2-5 minutes at a temperature of 100°-150°C to increase and hold the sodium hydroxide concentration on the root vegetable skin at approximately 20-30%, and (2) then withdrawing application of the hot gas stream and maintaining said root vegetables without supplying or removing heat for 3-10 minutes.
Claim 3
Dependent Claim
21 words
A method as claimed in claim 1, wherein said drying is carried out at a temperature of 110°-120°C for 3-4 minutes.
Claim 4
Dependent Claim
25 words
A method as claimed in claim 1, wherein the period of said maintaining of the root vegetables without supplying or removing heat is 5-6 minutes.
Claim 5
Dependent Claim
16 words
A method as claimed in claim 1, wherein hot air is used as the drying gas.
Claim 6
Dependent Claim
16 words
A method as claimed in claim 1, wherein superheated steam is used as the drying gas.
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) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |