Patent · US Active

Preparation of capsules

US9005494B2 · kind B2 · utility

25Cited by

339References

14Claims

0Family size

Assignee

E Ink Holdings Inc. · TW

Inventors

Peter J. Valianatos · Boston, US
Rajesh Chebiyam · Nashua, US
Jeremy J. Manning · Kingston, US
Michael L. Steiner · New Richmond, US
Thomas H. Whitesides · Somerville, US
Michael D. Walls · Charlottesville, US

Key dates

Filing date	Aug 10, 2009
Grant date	Apr 14, 2015
Priority date	—
Expiry date	Oct 18, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2998
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Prior art processes for producing protein-based capsules (for example, capsules for use in electrophoretic media) tend to be wasteful because they produce many capsules outside the desired size range, which is typically about 20 to 50 μm. Capsule size distribution and yields can be improved by either (a) emulsifying a water-immiscible phase in a preformed coacervate of the protein; or (b) using a limited coalescence process with colloidal alumina as the surface-active particulate material.

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