PATASSG
This file contains a record for every assignment of every patent. If a patent is assigned to more than one party, they are all listed, indexed by ASSGNUM.

This includes all types of patents. Type "0" are utility patents. 

Here is a data description:

Contains data from patassg.dta
  obs:     3,032,482
 vars:             7                          7 Apr 2008 11:23
 size:   275,955,862 (47.4% of memory free)
-------------------------------------------------------------------------------
              storage  display     value
variable name   type   format      label      variable label
-------------------------------------------------------------------------------
sta             str2   %2s                    assg/state
cnt             str3   %3s                    assg/country
assgnum         byte   %8.0g                  assg/assignee seq. number (imc)
cty             str72  %72s                   assg/city
pdpass          long   %12.0g                 Unique assignee number
ptype           str1   %9s                    patent type
patnum          long   %12.0g                 patent number
-------------------------------------------------------------------------------
Sorted by:  ptype  patnum

Sample data is:
     +--------------------------------------------------------------+
     | sta   cnt   assgnum         cty     pdpass   ptype    patnum |
     |--------------------------------------------------------------|
  1. |  IL               1     Chicago   10030271       0   3930271 |
  2. |  PA               1     Bedford   10156902       0   3930272 |
  3. |  MO               1   St. Louis   10112031       0   3930273 |
     +--------------------------------------------------------------+


The different types of patent included (and their counts) are:

patent type |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |  2,812,428       92.74       92.74 utility
          D |    198,114        6.53       99.28 design
          H |      1,812        0.06       99.34 Statutory Invention Registration
          P |     10,625        0.35       99.69 plant
          R |      9,281        0.31       99.99 reissue
          T |        222        0.01      100.00 defensive publication
------------+-----------------------------------
      Total |  3,032,482      100.00

NOTE!!: Utility patents are type 0 (Zero) NOT type O (letter o).


. sum

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
         sta |         0
         cnt |         0
     assgnum |   3032482    1.032456    .2302933          1         35
         cty |         0
      pdpass |   3032482    1.06e+07     2270722     -19842   1.62e+08
-------------+--------------------------------------------------------
       ptype |         0
      patnum |   3032482     5204501     1626040          1    7155745

.
. sum if ptype=="0"

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
         sta |         0
         cnt |         0
     assgnum |   2812428    1.034009    .2362862          1         35
         cty |         0
      pdpass |   2812428    1.08e+07     1834605     -19842   1.62e+08
-------------+--------------------------------------------------------
       ptype |         0
      patnum |   2812428     5583620      932019    3930271    7155745