Patent US2133853A successfully refreshed from Google Patents.
Patent US4525131A successfully refreshed from Google Patents.
Patent US2547168A successfully refreshed from Google Patents.
Patent US3302423A successfully refreshed from Google Patents.
US3302423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for freezing perishable material
Assignee: ELMWOOD PRODUCTS Inc
•
Filing: 1965-01-12
•
Granted: 1967-02-07
•
Expires: 1985-01-12
Abstract
No abstract record available.
Inventors
- 👤 Willard L Morrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:17
CPC Classifications
F; F25; F25D; F25D3/00; F25D3/10; F25D3/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A FREEZE DOWN APPARATUS WHICH INCLUDES AN INSULATED COLD TREATMENT CHAMBER HAVING A REFRIGERANT THEREIN, MEANS FOR PASSING MATERIAL TO BE FROZEN TO AND THROUGH THE CHAMBER ALONG TWO PATHS IN THE CHAMBER MEANS FOR SELECTING ONE PATH OR THE OTHER WHILE MAINTAINING REFRIGERATING CONDITIONS IN THE CHAMBER TO THEREBY ENABLE MATERIAL TO BE PASSED ALONG EITHER ONE OF THE DISIRED PATHS WITHOUT TERMINATION AND REESTABLISHMENT OF REFRIGERATING CONDITIONS DURING CHANGE OVER FROM ONE PATH TO THE OTHER, AND MEANS FOR SUBJECTING THE MATERIAL AS IT PASSES ALONG ONE PATH TO A RAIN OF LIQUID NITROGEN AND FOR IMMERSING THE MATERIAL AS IT PASSES ALONG THE OTHER PATH IN A BATH OF LIQUID NITROGEN.
Claim 2
Dependent Claim
114 words
A FREEZE DOWN APPARATUS WHICH INCLUDES AN INSULATED COLD TREATMENT CHAMBER HAVING A REFRIGERANT THEREIN, MEANS FOR PASSING MATERIAL TO BE FROZEN TO AND THROUGH THE CHAMBER ALONG TWO PATHS IN THE CHAMBER MEANS FOR SELECTING ONE PATH OR THE OTHER WHILE MAINTAINING REFRIGERATING CONDITIONS IN THE CHAMBER TO THEREBY ENABLE MATERIAL TO BE PASSED ALONG EITHER ONE OF THE DISIRED PATHS WITHOUT TERMINATION AND REESTABLISHMENT OF REFRIGERATING CONDITIONS DURING CHANGE OVER FROM ONE PATH TO THE OTHER, AND MEANS FOR SUBJECTING THE MATERIAL AS IT PASSES ALONG ONE PATH TO A RAIN OF LIQUID NITROGEN AND FOR IMMERSING THE MATERIAL AS IT PASSES ALONG THE OTHER PATH IN A BATH OF LIQUID NITROGEN.
References Cited (Backward Citations)
US2654587A
Cited
US2760654A
Cited
US2758389A
Cited
US2951353A
Cited
US3114248A
Cited
US3255608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |