Patent US4421774A successfully refreshed from Google Patents.
US4421774A
Expired / Lapsed
US
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Gaseous antimicrobial treatments of storage grain with sulfur dioxide and ammonia
Assignee: Arkema Inc
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Filing: 1982-05-03
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Granted: 1983-12-20
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Expires: 2002-05-03
Abstract
Abstract Novel sequential gas treatments for preserving grain are disclosed. Sulfur dioxide gas which has been bubbled through an organic acid, such as propionic acid, is perfused through grain to be treated and permitted to react with that grain for a preselected period of time, to produce a preserved grain product. This grain product is then preferably perfused with ammonia gas. Alternatively, residual sulfur dioxide may be dispersed within the treated grain mass through the introducton of a carrier gas prior to ammonia gas perfusion. Other preservative methods and substances are also disclosed which provide preserved grain products.
Inventors
- 👤 Frederick D. Vidal
- 👤 Anantharaman Jayaraman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:45
CPC Classifications
A; A23; A23B; A23B9/00; A23B9/16; A23B9/18; A23B9/24; A23B9/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
A method of treating moist grain to produce a preserved grain product which resists spoilage, comprising the steps of: (a) perfusing an effective amount of SO 2 gas through said grain for a period of time sufficient to assure adequate contact between the SO 2 and the grain; (b) permitting said grain to react with said SO 2 for a preselected period of time and under conditions suitable to produce an intermediate grain product by the SO 2 penetrating the grain thereby effecting antimicrobial actions in the grain; (c) perfusing said intermediate grain product with an effective amount of ammonia gas to produce a preserved grain product which resists spoilage.
Claim 2
Independent Claim
110 words
A method of treating moist grain to produce a preserved grain product which resists spoilage, comprising the steps of: (a) perfusing an effective amount of SO 2 gas through said grain for a period of time sufficient to assure adequate contact between the SO 2 and the grain; (b) permitting said grain to react with said SO 2 for a preselected period of time and under conditions suitable to produce an intermediate grain product by the SO 2 penetrating the grain thereby effecting antimicrobial actions in the grain; (c) perfusing said intermediate grain product with an effective amount of ammonia gas to produce a preserved grain product which resists spoilage.
Claim 3
Dependent Claim
29 words
The method of claim 1 further comprising the further step of introducing a carrier gas into said grain to disperse said SO 2 gas prior to performing step (c).
Claim 4
Dependent Claim
29 words
The method of claim 1 further comprising the step of activating said SO 2 gas by bringing said gas into contact with an acid prior to performing step (a).
Claim 5
Dependent Claim
26 words
The method of claim 3 wherein said step of activating said SO 2 gas further comprises bubbling said gas through a liquid bath of said acid.
References Cited (Backward Citations)
US1222830A
Cited
US1524494A
Cited
US1777044A
Cited
US2132786A
Cited
US3404987A
Cited
US3608085A
Cited
US3725081A
Cited
US3928577A
Cited
US3962475A
Cited
US4083999A
Cited
US4208443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |