US 11,914,401 B2
Airflow-based volumetric pump
Jeffrey A. Carlisle, Portsmouth, NH (US); Timothy S. Schroeder, Rochester, NH (US); and Thomas C. Plummer, Henniker, NH (US)
Assigned to Pneuma Systems Corporation, Portsmouth, NH (US)
Filed by Pneuma Systems Corporation, Portsmouth, NH (US)
Filed on Dec. 13, 2022, as Appl. No. 18/080,469.
Application 18/080,469 is a continuation of application No. 16/656,449, filed on Oct. 17, 2019, granted, now 11,550,345.
Claims priority of provisional application 62/746,558, filed on Oct. 17, 2018.
Prior Publication US 2023/0115695 A1, Apr. 13, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G05D 16/20 (2006.01); G05B 19/042 (2006.01); F04B 43/04 (2006.01)
CPC G05D 16/2013 (2013.01) [F04B 43/04 (2013.01); G05B 19/042 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for precision liquid delivery, the system comprising:
a gas reservoir having a known volume;
a tightly load-coupled pneumatic driver (a “TLCP driver”) configured to receive input power causing the TLCP driver to move gas into the gas reservoir to produce a gas drive pressure;
a valve configured to couple the gas reservoir with a fluid reservoir having an unknown volume of a liquid, the valve further configured to selectively isolate or pneumatically couple pressures in the gas reservoir and the fluid reservoir;
a gas-fluid interface that couples pressure in the fluid reservoir to pressure in a fluid path, the gas-fluid interface configured so that the fluid drive pressure driving liquid in the fluid path is substantially the same as the fluid reservoir pressure; and
a pressure sensor configured to detect pressure in the gas reservoir and/or the fluid reservoir.