So far I've come across 82 patents that don't have a cpc listed on uspto.gov. A text file of the patent numbers is
. I found a
| Patents without CPCs |
|---|
| patent_number | description |
| 1,540,886 | Hydraulic pressure controlling device |
| AI300 | no printed specification available oct 2 1860 |
| AI259 | Dec. 13, 1859 E. Parker Clothes-pin machine clothespin machines |
| RE14,777 | craft cheese chicago sterilizing cheese |
| RE14,532 | indicating device for moving picture films |
| RE14,470 | die stock |
| RE14,210 | cutting machine |
| RE13,326 | childs vehicle (horse with wheels) |
| RE12,269 | tool holder hunter 9 20 1904 |
| RE12,170 | storm apron (poncho) |
| RE12,167 | bread mixer and kneader |
| RE12,093 | side bearing last of patent day |
| RE12,087 | machine for excavating .. ballast |
| RE12,012 | lasting machine assigned to a shoe machinery company |
| RE11,978 | moving machine attachment |
| RE11,977 | amusement device |
| RE11,661 | r bennett saw tool reissued apr 26 1898 |
| RE11,655 | car ventilator |
| RE11,487 | mechanical movement |
| RE11,450 | calculating rule |
| RE11,359 | collapsible tap doolittle 8 15 1893 |
| RE11,033 | dado cutter |
| RE10,991 | ship's compass |
| RE10,892 | drilling machine |
| RE10,854 | pulley pattern molding press |