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For the Inventor, By the Inventor

Davis City, IA, United States of America

Douglas F McFarland

This inventor holds 14 USPTO granted patents. Top assignees: Shivvers, Inc., Farmhand, Inc., Other. Active years: 1977-1998.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Douglas F McFarland. Retrieved from https://idiyas.com/inventor/douglas-f-mcfarland

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 14

% Patents Active = 100.0

Average Co-Inventor Count = 1.1

ph-index = 8

Forward Citations = 160(Granted Patents)


Location History:

  • Davis City, IA (US) (1977 - 1989)
  • Lamoni, IA (US) (1994 - 1995)
  • Sidney, NE (US) (1998)

Company Filing History:

goldMedal2 out of 12 
 
Shivvers, Inc.
 patents
silverMedal1 out of 9 
 
Farmhand, Inc.
 patents
bronzeMedal12 out of 834,570 
Other
 patents
where one patent can have more than one assignee

Years Active: 1977-1998

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14 patents (USPTO):Explore Patents
1. 5784867 - Variable force traction enhance systems (1998-07-28),
2. 5392871 - Amphibious vehicle and control (1995-02-28),
3. 5279376 - Force neutralizing mechanism for a single lever control (1994-01-18),
4. 4867716 - Boat (1989-09-19),
5. 4773220 - Hydraulic transmission with coaxial power-take-off and motor shafts (1988-09-27),
6. 4757740 - Multiple barrel gun (1988-07-19),
7. 4557140 - Horsepower and fuel consumption gauge (1985-12-10),
8. 4473763 - Solenoid motor (1984-09-25),
9. 4278896 - Wind power generator (1981-07-14),
10. 4237834 - Governor control device (1980-12-09),
11. 4164995 - Inertia controlled conveyor clutch (1979-08-21),
12. 4084707 - Round bale loading and unrolling machine (1978-04-18),
13. 4042140 - Self-loading and unloading hay bale trailer (1977-08-16),
14. 4037692 - Speed responsive fluid coupling and clutch (1977-07-26),

Title: Innovations of Douglas F McFarland

Introduction

Douglas F McFarland is a notable inventor based in Davis City, IA (US). He holds a total of 14 patents, showcasing his significant contributions to the field of engineering and vehicle technology. His innovative spirit has led to the development of advanced systems that enhance vehicle performance and functionality.

Latest Patents

Among his latest patents is the "Variable Force Traction Enhance Systems," which provides variable force traction systems for vehicles. This invention includes hydraulic cylinders connected to an implement and fluidly linked to hydrostatic transmissions. The hydraulic cylinders actuate the implement in response to changes in hydraulic fluid pressures, improving traction and preventing the vehicle's rear end from bucking. Another notable patent is the "Amphibious Vehicle and Control," which features a hull and multiple-flighted outriggers that stabilize and propel the vehicle over both land and water. The vehicle's speed and direction can be controlled by a joystick, allowing for easy operation with a single hand.

Career Highlights

Throughout his career, Douglas has worked with various companies, including Shivvers, Inc. His experience in these organizations has contributed to his expertise in vehicle technology and innovation.

Collaborations

Douglas has collaborated with notable individuals such as Donald H Parkes and Xinzhan Yang, further enhancing his work and contributions to the field.

Conclusion

Douglas F McFarland's innovative patents and career achievements highlight his significant impact on vehicle technology. His work continues to inspire advancements in the industry, showcasing the importance of innovation in engineering.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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