Document OE4VEQzEQXGD5nv76rrkvoVZe

FILE NAME Oil Industry Asbestos Patents OIAP DATE 0000 DOC OIAP001 DOCUMENT DESCRIPTION Memo to Barry Castleman about Patents from 1915-1974 STEPHEN L. BERGER P.E. PATENT AGENT 4418 Pleasant Valley Court Oakland CA 94611 510 658-2256 PATENTS DISCLOSING ASBESTOS IN LUBRICATING GREASES OR OILS In chronological order 1,133,204 Continental Asbestos Corporation Asbestos ground up with lubricating oil Mar 23 1915 British 462,556 Celluloid Corporation Mar 11 1937 Page 2 left side lines 32-33 2,583,603 Honorary Advisory Council for Scientific and Industrial Research Jan 29 1952 Col. 5 lines 18-20 Example 5 and the Table 2,671,758 Shell Mar 9 1954 Col. 17 lines 36-39 British 785,936 ---- -- -- Nov 6 1957 British equivalent of 3,117,085 2,948,679 Texaco Aug 9 1960 Col. 6 lines 21-27 3,010,896 Texaco Nov 28 1961 Whole patent lubricants 3,028,334 Esso Col. 1 lines 12-23 discusses the disadvantage of asbestos in Apr 3 1962 Col. 2 lines 25-28 3,112,270 = Phillips Petroleum Nov 26 1963 Col. 4 lines 13-27 3,117,085 Texaco Jan 7 1964 Same disclosure as 2,948,679 British 986,192 Phillips Petroleum Mar 17 1965 British equivalent to 3,112,270 3,424,678 Esso Jan 28 1969 Grease with colloidal chrysotile asbestos from California Discussion of asbestos in lubracants starting second paragraph of col 1. Properties and dimensions in col 2 2.5-25 microns in length All examples except comparison examples have asbestos 3,433,743 Esso Mar 18 1969 Similar disclosure as above 3,424,678 3,437,593 Assigned to no company on the face of the patent but has something to do with the US Government du Pont possibly had a hand in this Apr 8 1969 See Abstract and Examples British 1,199,505 Esso Jul 22 1970 British equivalent to 3,424,678 and 3,433,743 British 1,215,271 Esso Dec 9 1970 Grease with colloidal chrysotile asbestos from California British 1,215,436 Esso Dec 9 1970 Similar disclosure as British 1,199,505 above with an inorganic thickener 3,639,236 3,639,237 Esso Esso Feb 1 1972 Feb 1 1972 3,639,644 Esso Feb 1 1972 These three patents all disclose the use colloidal asbestos 3,728,261 Phillips Petroleum Apr 17 1973 Grease that can contain asbestos See col 3 lines 25-35 3,773,663 Texaco Nov 20 1973 Grease thickened with coated fibrous asbestos British 1,353,500 Phillips Petroleum May 15 1974 British equivalent to 3,728,261 3,846,312 Texaco Nov 5 1974 Grease thickened with coated fibrous asbestos Discussion of asbestos in grease at col , lines 31-54