> ... regarding the history of CA Patent
> Indexes.
>
> Here are the facts:
>
> 1. The first CA Numerical Patent Index was published in
> Vol. 6 (1912). It was produced for two more years
> only: Vol. 7 (1913) and Vol. 8 (1914).
>
> 2. The CA Numerical Patent Index was reintroduced in Vol. 29
> (1935) and became a regular part of the CA Volume Indexes.
>
> 3. In 1944, the Special Libraries Association published a
> 30-year Collective Patent Index to Chemical Abstracts
> for Vols. 1-30 (1907-1936).
>
> It incorporated, without checking, the CA Patents Indexes
> published by CA in Vol. 29 (1935) and Vol. 30 (1936).
>
> 4. In 1949, CA published a 10-year Collective Patent Index
> for Vols. 31-40 (1937-1946). This was not part of the
> 4th CA Decennial Index for Vols. 31-40 (1937-1946).
>
> 5. Starting with the 5th Decennial Index for Vols. 41-50
> (1947-1956), the Numerical Patent Index became a
> regular part of the CA Collective Indexes.
>
> 6. In 1981, the Numerical Patent Index was combined with
> Patent Concordance. The latter was first introduced
> in Vol. 58 (1963).
>
-- Bob Buntrock
Buntrock Associates, Inc.