John J Slagter Deceased55 S Lincoln St UNIT 511, Denver, CO 80209

8017672, Sep 13, 2011

May 20, 2003

10/441712

Harvey Dale DeFord - Rancho Cucamonga CA, US
John Thomas Slagter - Grand Rapids MI, US

Polycem LLC - Spring Lake MI

C04B 24/26

524 5, 524 8

A polymer-cement composite comprises, by weight percent, about 40% to 50% inert, inorganic filler material, such as silica sand; about 12% to 23% latex, preferably in aqueous suspension; about 20% to 25% hydraulic cement; and reactive silica in an amount of at least about 6 weight percent. The reactive silica is a pozzolanic material, and in preferred embodiments, where the cement is portland cement, comprises an advantageous mixture of precipitated and ground silica. All solid components have a particle size of less than about 300 microns. The polymer-cement composite is preferably made by dry mixing of the powdered components throughly in a high intensity mixer, adding the liquid components, and wet mixing to form a thoroughly blended, de-aired green mixture. The green mixture is formed into any desired shape, cured, and dried. Preferably, the product is cured in a warm, moist environment.

6569923, May 27, 2003

Mar 17, 2000

09/528336

John T. Slagter - Kentwood MI, 49512-5617

C04B 1604

524 5, 106696, 106724, 106737, 428446, 428500, 428688

A polymer-cement composite comprises, by weight percent, about 40% to 50% inert, inorganic filler material, such as silica sand; about 12% to 23% latex, preferably in aqueous suspension; about 20% to 25% hydraulic cement; and about 7% to 13% reactive silica. The reactive silica is a pozzolanic material, and in preferred embodiments, where the cement is portland cement, comprises an advantageous mixture of precipitated and ground silica. All solid components have a particle size of less than about 300 microns. The polymer-cement composite is preferably made by dry mixing of the powdered components throughly in a high intensity mixer, adding the liquid components, and wet mixing to form a thoroughly blended, de-aired green mixture. The green mixture is formed into any desired shape, cured, and dried. Preferably, the product is cured in a warm, moist environment.

2023008, Mar 16, 2023

Jul 29, 2022

17/876999

John Thomas Slagter - Grand Rapids MI, US
Timothy Dykhuis - Grand Rapids MI, US

The Mackinac Technology Company - Grand Rapids MI

E06B 5/12
F42D 5/045
E04H 9/06

A blast-resistant window attachment, or retrofit window insulation system, wherein panes of polymer film, such as TPU or ETFE, are held in a roll-formed stainless steel frame to form a pane assembly. One or more pane assemblies are stacked to make a multilayer unit or are mounted in a robust polymer casing that is sized to fit the window frames of an existing building window or to attach to the wall of the building surrounding the window. The polymer film or films can absorb energy of a blast without breaking provided that the collective thickness of the film(s) is at least 20 mil, and preferably 24 mil or more. The casing is, preferably made from a high strength polymer, such as Acrylonitrile Butadiene Styrene, or a metal such as stainless steel. In experiments conducted by the Army Corp of Engineers, the retrofit window insulation system of the present invention, when securely bolted to the structural components of the building around the window, demonstrates a remarkable ability of the polymer film panes to absorb blast energy and mitigate secondary debris hazards.