(1) German Pat. 98642, Dec. 1, 1897 (Pauly). French Pat. 286692, March 10, 1899, and addition of October 14, 1899 (Fremery and Urban). French Pat. 286726, March 11, 1899, and addition of December 4, 1899. German Pat. 111313, March 16, 1899 (Fremery and Urban). English Pat. 18884, Sept. 19, 1899 (Bronnert). English Pat. 13331, June 27, 1899 (Consort. mulhousien).
(3) The actual lapse of this patent is due to the death of Despeissis shortly after it was taken.
(4) Without questioning the good faith of Pauly, it is nevertheless a fact that the original patent remains as a document, and therefore that the value of the Pauly patents is very questionable.
(5) Girard, Ann. Chim. et Phys, 1881 (5), 24, p. 337-384.
(1) Cross and Bevan, Cellulose, 1895, p. 8.
(4) Bronnert, American Pat. 646799, April 3, 1900.
(5) Cross and Bevan, Cellulose, 1895, p. 12.
(1) English Pat. 8700, 1892. German Pat. 70999, Jan. 13, 1893.
(2) English Pat. 4713, 1896. German Pat. 92590, Nov. 21, 1896.
(3) Comptes rendus (loc. cit.). Berichte, c. 9, 65a.
(4) English Pat. 1020, 1898. German Pat. 108511, Oct. 18, 1898.
C. F. CROSS and E. J. BEVAN (J. Soc. Chem. Ind., 1896, 317).
The object of this paper is mainly to correct current statements as to the artificial or 'cellulose silks' being explosive or highly inflammable (ibid., 1895, 720). A specimen of the 'Lehner' silk was found to retain only 0.19 p.ct. total nitrogen, showing that the denitration is sufficiently complete to dispose of any suggestion of high inflammability.
The product yielded traces only of furfural; on boiling with a 1 p.ct. solution of sodium hydrate, the loss of weight was 9.14 p.ct.; but the solution had no reducing action on Fehling's solution. The product in denitration had therefore reverted completely to a cellulose (hydrate), no oxy-derivative being present.
The authors enter a protest against the term 'artificial silk' as applied to these products, and suggest 'lustra-cellulose.'
DIE KÜNSTLICHE SEIDE-IHRE HERSTELLUNG, EIGENSCHAFTEN UND VERWENDUNG.
~ARTIFICIAL SILK--ITS PRODUCTION, PROPERTIES, AND APPLICATIONS.~
This work of some 130 pages is an important monograph on the subject of the preparation of artificial cellulose threads--so far as the technical elements of the problems involved are discussed and disclosed in the patent literature. The first section, in fact, consists almost exclusively of the several patent specifications in chronological order and ranged under the sub-sections: (a) The Spinning of Nitrocellulose (collodion); (b) The Spinning of other Solutions of Cellulose; (c) The Spinning of Solutions of the Nitrogenous Colloids.