US 11,885,333 B2
Fiber-reinforced rubber compound useful in PDM stators
Peter Thomas Cariveau, Houston, TX (US); and Robert Bohmer, Kingwood, TX (US)
Assigned to Abaco Drilling Technologies LLC, Houston, TX (US)
Filed by Abaco Drilling Technologies, LLC, Houston, TX (US)
Filed on Dec. 28, 2022, as Appl. No. 18/147,506.
Application 18/147,506 is a continuation of application No. 17/318,785, filed on May 12, 2021, granted, now 11,542,944.
Application 17/318,785 is a continuation of application No. 16/258,826, filed on Jan. 28, 2019, granted, now 11,015,603, issued on May 25, 2021.
Application 16/258,826 is a continuation of application No. 15/292,798, filed on Oct. 13, 2016, granted, now 10,215,176, issued on Feb. 26, 2019.
Claims priority of provisional application 62/240,876, filed on Oct. 13, 2015.
Prior Publication US 2023/0141414 A1, May 11, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. F01C 5/00 (2006.01); F03C 2/00 (2006.01); F04C 2/00 (2006.01); F04C 29/00 (2006.01); B29C 70/62 (2006.01); F04C 2/107 (2006.01); F03C 2/08 (2006.01); C08K 7/02 (2006.01)
CPC F04C 29/00 (2013.01) [B29C 70/62 (2013.01); C08K 7/02 (2013.01); F03C 2/08 (2013.01); F04C 2/1075 (2013.01); C08L 2205/16 (2013.01); F05C 2225/02 (2013.01); F05C 2253/04 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A rubber compound for use in a stator, the rubber compound comprising:
a fiber reinforcement, the fiber reinforcement including a plurality of fibers, wherein fibers in the fiber reinforcement create a grain direction in which “with the grain” is generally orthogonal to “across the grain”, wherein the rubber compound has a first value for 25% tensile Modulus “across the grain” and a second value for 25% tensile Modulus “with the grain”, wherein the first value is at least 10% lower than the second value;
wherein the fiber reinforcement includes a fiber loading of greater than 1.0 phr of fibers; and
wherein the rubber compound has a 25% tensile Modulus of greater than 400 psi “across the grain” and a 50% tensile Modulus of greater than 700 psi “across the grain”.