Patent · US Active

Pharmaceutical syringe piston

US11369742B2 · kind B2 · utility

2Cited by

4References

20Claims

0Family size

Assignee

West Pharmaceutical Services, Inc. · US

Inventors

Jeffrey M. Laubach · Emmaus, US
Jurgen Brinkhues · Aachen, DE
Heike Gruen · Aachen, DE
Joel Worman · Palm Harbor, US
Xia Zhao · Highland Park, US
Jason Mattia · Downingtown, US

Key dates

Filing date	Mar 15, 2019
Grant date	Jun 28, 2022
Priority date	—
Expiry date	Aug 29, 2039

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61M2205/0222
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

A pharmaceutical syringe piston having a longitudinal axis includes a body having a central face portion with a first outer circumference and maximum first diameter. A cylindrical sealing portion proximate the central face portion has first and second axial ends and a wall extending therebetween. The wall has a second outer circumference and a second diameter essentially constant along the longitudinal axis between the first and second axial ends of the cylindrical sealing portion and is larger than the maximum first diameter. An annular curved portion has a maximum outer diameter less than the second diameter and connects the first axial end of the cylindrical sealing portion to the first outer circumference. An inert film encloses the central face portion and at least part of the annular curved portion and has an outer boundary between the first axial end of the cylindrical sealing portion and the first outer circumference.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.