Abstract: An apparatus for determining exposure to an oxidative sterilant is described. The apparatus includes a chemical indicator for indicating exposure to the oxidative sterilant and a biological indicator for determining the effectiveness of the exposure to the oxidative sterilant. The chemical indicator has a metallic surface with a non-pH sensitive permanent indicator on the surface for indicating exposure to the oxidative sterilant. The chemical indicator may be on a self-contained biological indicator. The biological indicator and chemical indicator may be inside a test pack, where the test pack restricts sterilant flow to the indicators.

Abstract: An apparatus for determining exposure to an oxidative sterilant is described. The apparatus includes a chemical indicator for indicating exposure to the oxidative sterilant and a biological indicator for determining the effectiveness of the exposure to the oxidative sterilant. The chemical indicator has a metallic surface with a non-pH sensitive permanent indicator on the surface for indicating exposure to the oxidative sterilant. The chemical indicator may be on a self-contained biological indicator. The biological indicator and chemical indicator may be inside a test pack, where the test pack restricts sterilant flow to the indicators.

Abstract: A method and apparatus detect exposure to an oxidation-type sterilant using a non-PH-sensitive bleachable dye as a chemical indicator. A change in color indicates exposure to oxidation-type sterilant.

Abstract: A method and apparatus for detecting exposure to an oxidation-type sterilant using a chemical indicator comprising bleachable dye is disclosed. Using the method and apparatus disclosed, a bleachable azo dye is incorporated with an anodized aluminum or chromate conversion coated surface and exposed to an oxidation-type sterilant, such as hydrogen peroxide, and inspected upon completion of the sterilization process for color change. If exposed to sterilant for an appropriate amount of time the bleachable dye changes color thereby indicating adequate sterilization. The surface incorporating bleachable dye may be made to change color after a predetermined number of exposures to a oxidation-type sterilant.

Abstract: The applicants have provided laminates prepared by (a) impregnating a glass fabric with an N-methyl-2-pyrrolidone solution of a compound having the structure of Formula A shown in FIG. 1 of the drawings, (b) heating the impregnated glass fabric to remove solvent therefrom and to covert the amic acid groups to imide groups, and (c) assembling a plurality of the impregnated glass fabrics from (b) and heating the assembly under pressure to a temperature in the range of 177.degree.-260.degree. C.

Abstract: The products of the invention are partial acetylene end-capped oligomers which have the structure as shown in FIG. 3 in which terminal R" group is derived from a mixture consisting of about 14-40 mol % of an aromatic monoamine and the balance an acetylene substituted aromatic monoamine. The products are prepared from either of two (2) precursors. The first precursor has the structure shown in FIG. 2. The second precursor is a complex amine salt having the structure shown in FIG. 5.

Abstract: The products of the invention are end-capped polyimide oligomers prepared from a dianhydride of an aromatic tetracarboxylic acid such as 3,3'4',4'-benzophenonetetracarboxylic acid, an aromatic diamine, and a 1-(aminoaryl)-3-hydroxy-3-methyl-1-butyne. The structure of the polyimide oligomers is shown in FIG. 3.

Abstract: The products of the invention are end-capped polyimide oligomers prepared from a dianhydride of an aromatic tetracarboxylic acid such as 3,3'4,4'-benzophenonetetracarboxylic acid, an aromatic triamine, and a 1-(aminoaryl)-3-hydroxy-3-methyl-1-butyne. The structure of the polyimide oligomers is shown in FIG. 3.

Abstract: Acetylene end-capped polyimide oligomers are prepared by a process including the following sequential steps:1. Preparing an alkanol or ether solution containing substantially 1 molar equivalent of a dialkyl ester of an aromatic tetracarboxylic acid,2. Adding substantially 0.5 to 0.8 molar equivalent of an aromatic diamine to the solution of (1) to form a reaction product between the diacid and the diamine,3. Adding an aminoarylacetylene to the solution of (2) in a quantity sufficient to provide amine groups equivalent to the free carboxylic acid groups present in the product of (2).4. Heating the solution of (3) to vaporize the solvent therefrom, and5. Heating the product of (4) to convert the carboxylic acid groups, the ester groups, and the amino groups thereof to imide groups.The temperature in steps (2) and (3) is maintained below about 50.degree. C. The temperature in steps (4) and (5) is maintained below about 210.degree. C.

Abstract: The applicants have provided novel heat curable resin compositions consisting predominately of a chemical compound having the structure of Formula A shown in FIG. 1 of the drawings. A desirable characteristic of the novel resin compositions of the invention is that they have a high solubility in selected solvents such as N-methyl-2-pyrrolidone (NMP) so that resin solutions containing at least 30 weight % resin solids at ambient temperature can be prepared. Glass fabric laminates having a high loading of resin are easily prepared from such solutions. Typically, high solids solutions of the compounds of Formula A are prepared by a three-step process. A solution containing at least 17 weight % of 3,3',4,4'-benzophenonetetracarboxylic acid dianhydride (BTDA) in N-methyl-2-pyrrolidone (NMP) is prepared by heating the BTDA and NMP to a temperature of at least 150.degree. C with stirring. The solution then is cooled to a temperature of about 60.degree. C and substantially 0.