Method for a pressure-based determining of a product parameter in a freeze dryer, freeze dryer and software product
US10982896B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2018 |
| Grant date | Apr 20, 2021 |
| Priority date | — |
| Expiry date | Aug 29, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B2700/19
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Methods are disclosed for the pressure-based determining of a product parameter in a freeze dryer, in particular a product temperature. At a point in time tSTART, a closing element as an intermediate valve between an ice chamber and a drying chamber of the freeze dryer is closed. Then, during a pressure rise occurring due to the sublimation pressure values (P1, P2, . . . ) are measured in the drying chamber. At a point in time tEND then the closing element is opened. From the measured pressure values (P1, P2, . . . ) an approximation of a product parameter, in particular a product temperature TAPPROX, is determined. The point in time tEND is determined specifically for the measured pressure values (P1, P2, . . . ) such that the time span for which the closing element is closed depends on the determined pressure values and such that the time span is variable during a drying process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.