Cold storage temperature monitor
Abstract
Abstract This invention comprises a reusable temperature recording telltale for cryogenic refrigerators, and in particular a telltale for use in a cryogenic refrigerator with racks for the storage of ampules, vials or other containers. The telltale device consists of an ampule, vial or other similar container which contains a liquid which has a melting-freezing point at a definite known temperature. This contained liquid within the ampule is frozen in a first orientation, and placed in the cryogenic refrigerator in a second orientation, but since frozen, it maintains its first orientation. However, if the cryogenic refrigerator achieves a temperature above the melting-freezing point of the contained liquid, it takes up the second orientation, recording the temperature excursion. Further, when a series of ampules containing liquids have varying meltingfreezing points, the temperature excursion can be closely calculated, and when used in combination with a rack which maintains the orientation within the refrigerator, there is no possibility of an erroneous reading.
Inventors
- 👤 John B Peterson
Bibliographic Details
Claims Analysis
Total Claims: 3References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |