Patent US3945170A successfully refreshed from Google Patents.
US3945170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extension of shelf life of fresh produce
Assignee: Individual
•
Filing: 1975-02-25
•
Granted: 1976-03-23
•
Expires: 1995-02-25
Abstract
Abstract A method is disclosed for extending the shelf life of foods including washing to remove any pesticides which may be present, drying, packaging in a nonporous, sealed container and irradiating with radio frequency electromagnetic waves.
Inventors
- 👤 Rodney F. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:28
CPC Classifications
A; A23; A23B; A23B2/00; A23B2/05; A23B2/08; A23B2/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
116 words
A process for the preservation of foods including the steps of: 1. washing the foods as required to remove any pesticides which may be present, 2. placing said foods in a container of a material which is essentially airtight but which permits the passage of radio frequency waves therethrough, 3. sealing said container, and 4. irradiating said sealed container with a source of radio frequency electromagnetic energy wherein said source is capable of producing a first band of energy in the range of 20 MHz to 330 MHz and a second band of energy in the range of 50 KHz to 200 KHz, said energy being at power levels between thirty watts and three hundred watts.
Claim 2
Dependent Claim
116 words
A process for the preservation of foods including the steps of: 1. washing the foods as required to remove any pesticides which may be present, 2. placing said foods in a container of a material which is essentially airtight but which permits the passage of radio frequency waves therethrough, 3. sealing said container, and 4. irradiating said sealed container with a source of radio frequency electromagnetic energy wherein said source is capable of producing a first band of energy in the range of 20 MHz to 330 MHz and a second band of energy in the range of 50 KHz to 200 KHz, said energy being at power levels between thirty watts and three hundred watts.
Claim 3
Dependent Claim
39 words
A process for the preservation of foods as set forth in claim 1 wherein the frequency of said first band of energy is substantially 28.5 MHz and the frequency of said second band of energy is substantially 100 KHz.
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) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |