Condenser, hermetic sealing, high and low temperature resistant
US4909317A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1988 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Jun 3, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/121
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A condensing apparatus is provided which can be used in gas chromatography measurements to determine N-methyl-2-pyrrolidone (NMP) content in polyimide prepreg. The condenser comprises a straight vertical section of thin-walled copper tubing followed by an ascending helical coil surrounding the straight section. The condenser is equipped with valves at the inlet and outlet which are capable of withstanding the combination of high and low temperatures as well as being resistant to damage by aggressive solvents. Liquid condensate accumulates at the bottom of the coil, making decanting easy. The condenser apparatus of the present invention yields very high collection efficiencies for volatile mixtures with a very wide range of boiling points. The condenser is very compact and lightweight and does not require any packing insulation to achieve the high collection efficiencies. Maintenance and cleaning are greatly simplified by the absence of packing. The all-metal construction of the condenser makes it extremely rugged and assures an operating life of hundreds of cycles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.