Drafting Patent Backgrounds: Field, Prior Art, and Examiner Role

An invention must fall within a specific field of technology to be patentable. The background of the invention provides information about its “field of invention” and “prior art.” By describing these elements, the background connects the invention to its broader technological context and highlights the gap the invention seeks to fill.

Technological Fields

Broad technological fields can include mechanical, electrical, chemical, biotechnology, computer science, or others. The concept of broad fields is similar to different departments in a technical institute or engineering college, where each department focuses on a particular area of expertise.

Patent Office Structure

Patent offices are organized into departments that correspond to these technological fields. Examiners and staff specialize in specific technology areas, and patent applications are assigned to examiners with expertise in the relevant domain. This ensures that the examination is performed by a domain expert.

Patent Application Components

The “Field of Invention” is a broad statement about the invention’s area, while the “Prior Art” description outlines previous efforts or existing knowledge in that domain. The background section aims to highlight the gap between prior art and the current invention, establishing the novelty and inventiveness of the new solution.

Examples of Patent Backgrounds

• Electric Lamp Patent – Stated an improvement in electric lamps and their manufacturing method.
• Television System Patent – Described the field as a TV apparatus and process for transmitting visual or moving figures using electricity, and also outlined prior art efforts in this domain (the example dates to 1927).
• Adhesive Patent – Identified the field as an elastomeric, insoluble solvent adhesive and indicated a lack of products like insoluble polymers for handling elastomers, thereby showing a clear gap.

Drafting Considerations

Indian law requires applicants to demonstrate technical advancement. It is necessary to state the problem or deficiency within the prior art. Applicants should avoid directly comparing their invention to prior art because the patent examiner performs this comparison. Direct comparison by the applicant can make the invention appear obvious to the examiner, potentially leading to rejection. The patent office compares prior art to assess novelty.

US vs. Indian Patent Formats

In the United States, the background typically includes two parts: the Field of Invention and the Prior Art Description. The Indian patent format is more flexible; the Field of Invention can appear as a separate heading, and there are no strict rules governing its placement.