Power Charging generator combined voltage regulation - File 500, 1927

The Vincent G. Apple Papers document the work of a great inventor and entrepreneur of Dayton. Through these papers, researchers may learn about the various inventions and innovations Apple made during his lifetime and their lasting impression on the automotive field.

Series I, Personal Papers, contain personal correspondence between Apple and various family members and friends. This series also contains mortgages and financial records, along with the deed to the Pinnacle Farm, Apple's home in Miamisburg. The researcher will also find miscellaneous memorabilia of Apple's including a Free Mason Yearbook, a World's Fair book, Apple's diploma from Miami Commercial College and a magazine highlighting his work.

Series II, Corporate Records, is separated into five subseries. Subseries IIA, Business Records, contains mostly corporate records for the Dayton Electrical and Manufacturing Company, Apple Electric Company and Apple Laboratories. Subseries IIB, Agreements and Contracts, contains agreements with other corporations for use of patents. Subseries IIC, Lab Notes/Diaries, consists of lab notes which Apple called "diaries," for testing and manufacturing inventions. Subseries IID, Product Guides, Samples and Journals, contains guides of the products that utilize these patents. Subseries IIE, Engineering Projects, consists of notes and blueprints of research for inventions.

Series III, Corporate Correspondence, contains correspondence regarding the use of patents and inventions, along with receipts, statements and other general communication. This series is arranged both chronologically and alphabetically in accordance with the original order of the papers. From 1892 through 1920, the correspondence is arranged chronologically. From 1920 on, it is arranged alphabetically.

Series IV, Legal Correspondence, is separated into three subseries. Subseries IVA, General Correspondence, contains correspondence to and from patent lawyers. Subseries IVB, Interference Records, contains documentation of litigation regarding patent infractions. Subseries IVC, Ford Trial, includes transcripts of the trial and correspondence to and from lawyers and the Ford Motor Company.

Series V, Photographs, contains mostly photographs and cyanotypes of his inventions and factory workers. Most are unidentified in terms of date and subject.

Series VI, Patents, is separated into six subseries. Subseries VIA, Patent Groups, contains groupings of related patents. Subseries VIB, Other Patents, includes patents not held by Apple, but used for research or infringement cases. Subseries VIC, Patent Article and Method Files, contains a grouping system devised by the laboratory. Subseries VID, Patent Improvements and Lists, contains proposed improvements for patents and an inventory of issued and filed patents for Apple. Subseries VIE, Patent File Wrappers and Issued Patents, contains the complete patent application and if available, issued patent certificate. The patent wrapper term is "Patent No" and the issued patent term is "Issued Patent No." Subseries VIF, Patents Filed, includes patent applications that were filed, but do not have a corresponding patent number assigned to the invention.