John H Donaldson

Title: John H. Donaldson and His Animal Vaccine Applicator.

Introduction

John H. Donaldson is an inventor associated with Melbourne, Australia, and Wellcome New Zealand Limited. His patent work addresses the practical delivery of vaccines and other substances to animals.

Latest Patents

Donaldson is associated with 1 patent, titled “Applicators.” The invention describes an applicator with a head containing a chamber and needle, with an elongate, movable proboscis or cover surrounding at least part of the needle. A reservoir attached to the applicator head supplies the vaccine or other substance.

The device uses valves to control the flow between the reservoir, chamber, and needle. When the trigger is actuated, a spring-biased mechanism moves a wall of the chamber outward, opening the reservoir valve and drawing a measured amount of substance into the chamber. The dose remains there until axial movement of the proboscis relative to the needle opens the valve between the chamber and needle, allowing the substance to be delivered.

Career Highlights

The available information connects Donaldson’s invention to Wellcome New Zealand Limited. His applicator design combines dose measurement, controlled fluid transfer, and needle protection in a mechanism intended for animal treatment.

Collaborations

Donaldson’s listed coworkers include Robert Brunswick and Andrew J. Foulkes. The available details do not specify their individual roles in the patent.

Conclusion

John H. Donaldson’s patent describes a controlled applicator for delivering measured doses of vaccines or other substances to animals, linking his inventive work with Wellcome New Zealand Limited.