Hygrometer

• US 3,240,693 A
• Filed: 08/28/1961
• Issued: 03/15/1966
• Est. Priority Date: 08/28/1961
• Status: Expired due to Term

• Current Assignee: Douglas B. Gardner
• Original Assignee: Douglas B. Gardner
• Inventors: Gardner, Douglas B.
• Application Number:
  US04/134,506
• Time in Patent Office: 1,660 Days
• US Class Current: 204/430
• CPC Class Codes: G01N 27/423 Coulometry

Claims

1. A PROCESS OF MAKING AN ELECTROLYTIC HYGROMETER CELL COMPRISING THE STEPS OF:

SPACE WINDING A SINGLE PAIR OF ELECTTRICAL CONDUCTORS ON A MANDREL SO THAT SAID CONDUCTORS ARE SUBSTANTIALLY EQUALLY SPACED FROM EACH OTHER WHILE EXERTING SUFFICIENT TENSION ON SAID CONDUCTORS TOCAUSE THEM TO PARTIALLY FLATTEN AGAINST SAID MANDREL;

DISPOSING A JACKET OF A THERMOPLASTIC RESIN AROUND SAID WINDING AND SAID MANDREL;

APPLYING PRESSURE TO THE EXTERNAL SURFACE OF SAID JACKET TO SUBSTANTIALLY COMPLETELY FILL THE SPACE BETWEEN SAID CONDUCTORS WITH SAID RESIN;

REMOVING SAID MANDREL FROM SAID JACKET WHEREBY AN ANNULAR PASSAGEWAY IS FORMED IN SAID JACKET;

AND COATING A THIN FILM OF A HYGROSCOPIC SUBSTANCE ON THE SURFACE OF SAID ANNULAR PASSAGEWAY OVER THE ENTIRE LENGTH OF SAID WINDING.