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Searching for U.S. Patents on the Internet

Step 2: Look up terms relating to the invention using the Index to the U. S. Patent Classification.   

The Index to the U. S. Patent Classification is a dictionary-like list of terms describing inventions and their functions, effects, end-products, and uses.  It is found online an also is available in print format at SciPTDL T223.A25. To continue with the search for patents related to aramid fiber insulation, We should choose I from the alphabet presented on the search page. In the index of words beginning with I use the Edit - Find command to locate insulation on the page or just scan down the alphabetical listing.

Here is an excerpt from the Index to the U. S. Patent Classification:


Insulation and Insulating  
    Building wall ..........................  52 / 404.1+
        By lamina ..........................  52 / 408+
            Yieldable ......................  52 / 393+
    Electric ...............................  174
        Battery separator ..................  429 / 247+
        Bridged rail joint .................  246 / 48
        Bushings ...........................  174 / 152 R+
        Capacitor winding ..................  242 / 441.1+
        Ceramic composition ................  501 / 1+
        Conductor cover burnishing .........  29 / 90.5
        Fluent composition .................  252 / 570+
        Handle .............................  16 / 431+
        Indefinite length conductor ........  156 / 47+
        Covering ...........................  156 / 47+
        Lamp sockets .......................  439

Click on the classification code or the subclass numbers that look interesting. This will link to the classification schedule. You should also try to look up the other concepts of the search such as fire, retardant, fabric, fiber, etc. Click on relevant class numbers to transfer to the Manual of Classification.

Look up the appropriate classification code in the Manual of Classification.  

The Manual of Classification is a list of all classification codes used by U.S. patent examiners. Because the Manual is used to categorize all of the more than six million patents that have passed through the U.S. Patent Office, it is a very precise and expansive list, with hundreds of categories (classes) and thousands of subcategories (subclasses). Patent examiners assign one or more classification codes to each issued patent, based on the subject matter of the invention. Many patents have 5 - 15 classes and subclasses assigned. 

In the Manual of Classificationsearch boxes type in the class and subclass numbers that you have located while doing the keyword, inventor name, and company searches. Input the class number in the left box and the subclass number in the second box. We will try 428/299.7. Input the number, click on class schedule HTML version, and then scan down and click on SUBMIT.

 
A. Access Classification Info by Class/Subclass
  1. Enter a USPC Classification...
   
/
 

The resulting list displays the subclass numbers near 299.7 and their corresponding headings.

Manual of Classification listing for Class 428.   

[List of Patents for class 428 subclass 297.4]   297.4           .. Fiber embedded in or on the surface of a polymeric matrix
[List of Patents for class 428 subclass 297.7]   297.7           ... Fiber is on the surface of a polymeric matrix having no embedded portion
[List of Patents for class 428 subclass 298.1]   298.1           ... Fibers are aligned substantially parallel
[List of Patents for class 428 subclass 298.4]   298.4           .... Fiber is nonlinear (e.g., crimped, sinusoidal, etc.)
[List of Patents for class 428 subclass 298.7]   298.7           .... Fiber is precoated
[List of Patents for class 428 subclass 299.1]   299.1           .... Carbon or carbonaceous fiber
[List of Patents for class 428 subclass 299.4]   299.4           .... Glass fiber
[List of Patents for class 428 subclass 299.7]   299.7           .... Polymeric fiber

If you scan to the top of this page we see that Class 428 is Stock Material or Miscellaneous Articles. You can use the EDIT - FIND command to go back to the subclass number(s) of interest. At this point you could look at a list of patents for a subclass of interest by clicking on the [List of Patents for class 428 subclass 299.4]. Step 3 will describe how going to look at the Classification definitions is important and will broaden your search if necessary or allow you to define exactly the classes of interest.

Go to Step 3. 

Return to the Fogler Library Patent and Trademark Resource Center homepage. 

 

For more information, contact:
Martin Wallace
Science and Engineering Center
Patent and Trademark Depository
Raymond H. Fogler Library
Orono, Maine 04469-5729 
Phone: 207-581-1678


Created by: Martin Wallace | Revised:

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