Kwokshun C Cheng, 727 Federal Hill Rd, Nashua, NH 03062
Kwokshun Cheng Phones & Addresses
Nashua, NH
Boston, MA
Bedford, MA
Londonderry, NH
Attleboro, MA
Springfield, MA
Derry, NH
Mentions for Kwokshun C Cheng
Publications & IP owners
Us Patents
Oleophobic Fluoropolymers And Filter Materials Prepared Therefrom
US Patent:
2023002, Jan 26, 2023
Filed:
Jun 22, 2022
Appl. No.:
17/847088
Inventors:
- Billerica MA, US
Dongzhu Wu - Hangzhou, CN
Yun Jia Xia - Hangzhou, CN
Kwokshun Cheng - Nashua NH, US
Dongzhu Wu - Hangzhou, CN
Yun Jia Xia - Hangzhou, CN
Kwokshun Cheng - Nashua NH, US
International Classification:
C08F 214/18
C08F 220/18
C08K 5/14
B01D 67/00
C08F 220/18
C08K 5/14
B01D 67/00
Abstract:
The disclosure provides an improved process for preparing oleophobic fluoropolymers. The resulting fluropolymers were found to be effective in imparting hydrophobic and oleophobic properties to porous polymeric membranes such as PTFE. The treated PTFE membrane can reach an oleophobic level of 6 or above, (according to the AATCC-118-1997 oil repellency test method) with a low air flux loss.
Acid Resistant Filter Media
US Patent:
2021039, Dec 23, 2021
Filed:
Jun 23, 2021
Appl. No.:
17/356201
Inventors:
- Billerica MA, US
KwokShun CHENG - Nashua NH, US
Jad A. JABER - Westford MA, US
Nicholas J. FILIPANCIC - Medford MA, US
KwokShun CHENG - Nashua NH, US
Jad A. JABER - Westford MA, US
Nicholas J. FILIPANCIC - Medford MA, US
International Classification:
C09D 177/02
B01D 69/02
B01D 69/02
Abstract:
Provided are certain membranes useful in the filtration of liquids and removal of various contaminants therein. In certain aspects the membranes have as one component a polyamide such as Nylon 11 and/or Nylon 12. Also provided is methodology for manufacturing such membranes and their use in filtration and purification of liquids. Membranes of the disclosure thus prepared exhibit superior acid stability when compared to polyamide membranes prepared from Nylon 6 or Nylon 6,6.
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