Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2005-04-19
2005-04-19
Lechert, Jr., Stephen J. (Department: 1732)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S792000, C524S795000, C241S025000, C241S029000, C428S402000
Reexamination Certificate
active
06881784
ABSTRACT:
A method for producing submicron polytetrafluoroethylene (“PTFE”) powder in a free-flowing, readily dispersible form. The irradiated PTFE starting material is placed in a desired solvent and undergoes grinding until the PTFE particles reach submicron size. The submicron particles are subsequently recovered from the solvent and dried to form a powder that may have particles less than 1.00 μm in size. The dry PTFE powder may then be readily dispersed to submicron size into a desired application system. The submicron PTFE powder of this method is free-flowing, readily dispersible in various application systems, tends not to “dust” or self-agglomerate. Improved aqueous and organic dispersions of submicron PTFE particles may also be formed that display increased stability and require much less agitation than other processes of forming such dispersions. Such improved PTFE dispersions may be formed with or without the addition of surfactants, wetting agents, rheology modifiers, pH-adjusting agents, and the like.
REFERENCES:
patent: 3766031 (1973-10-01), Dillon
patent: 4029870 (1977-06-01), Brown et al.
patent: 4748005 (1988-05-01), Neuberg
patent: 4777192 (1988-10-01), Neuberg
patent: 4888122 (1989-12-01), McCready
patent: 5149727 (1992-09-01), Luniewski
patent: 5181268 (1993-01-01), Chien
patent: 5263256 (1993-11-01), Trankiem
patent: 5296113 (1994-03-01), Luniewski
patent: 5891573 (1999-04-01), Neuberg et al.
patent: 5968997 (1999-10-01), Luniewski et al.
patent: 6274254 (2001-08-01), Abys et al.
Willson, Industrial Lubrication and Tribology, 44:3-5 (Mar./Apr. 1992).
Hadley et al., Metal Finishing, 85:51-53 (Dec. 1987).
“Niflor Engineered Composite Coatings,” Hay N., International, Ltd. (1989).
Awad Youssef
Cody Charles A.
Neuberg William
Sui Manshi
Baker Bott LLP
Lechert Jr. Stephen J.
Tejwani Manu J.
LandOfFree
Methods for producing submicron polytetrafluoroethylene... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods for producing submicron polytetrafluoroethylene..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods for producing submicron polytetrafluoroethylene... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3390796