Ultimax© Corporation is a manufacturer of RSC, Rapid Strength Cement (Concrete). Ultimax Cement is the only patented product, covered under U.S. Patent Nos. 4,957,556, 6,113,684, 6,406,534 and 6,758,896, in the market that achieves in 1 hour: 4,000 psi (28 MPa) in compressive strength and 550 psi (3.8 MPa) in flexural strength, which exceed CalTransí requirements at highway opening time.