Specimen holder and technique employed to effect a continuous maximum concentration gradient in critical point drying

US4003135A · kind A · utility

Assignee

• The United States of America, as represented by the Secretary of Agriculture · US

Inventors

• Frederick L. Baker · Lafayette, US
• Lambertus H. Princen · Peoria, US

Key dates

• Filing date: Jun 13, 1975
• Grant date: Jan 18, 1977
• Expiry date: Jun 13, 1995

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F26B5/00
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present device and technique enables a small specimen to be subject to a continuous maximum concentration gradient by continually replenishing the fluid coming in contact with the specimen. Accordingly, the diffusion rate from the specimen to the fluid in contact is maintained at a high level, and the fluid-exchange steps are completed quickly. Further, the device is designed to hold a plurality of specimens so that a number of specimens can be "dried" simultaneously and quickly.