William A Mittelstadt

This inventor holds 50 USPTO granted patents and 2 published patent applications and 11 EPO patents, primarily in Respiratory Protection. Top assignees: 3M Innovative Properties Company, United States Surgical Corporation, Other. Active years: 1991-2024.

IDiyas Innovation Intelligence. (2026). Inventor Profile: William A Mittelstadt. Retrieved from https://idiyas.com/inventor/william-a-mittelstadt

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

USPTO Granted Patents = 50 (Patent Applications = 2)

% Patents Active = 94.0

EPO Patents = 11 (Patent Applications = 13)

Average Co-Inventor Count = 2.5

ph-index = 19

Forward Citations = 1,437(Granted Patents)

Forward Citations (Not Self Cited) = 1,326(Dec 10, 2025)

Location History:

Saint Paul, MN (US) (1991 - 1994)
Woodbury, MN (US) (1994 - 2021)
Cottage Grove, MN (US) (2019 - 2024)

Company Filing History:

48 out of 22,398

3M Innovative Properties Company

patents

2 out of 1,184

United States Surgical Corporation

patents

1 out of 834,513

Other

patents

where one patent can have more than one assignee

Years Active: 1991-2024

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Areas of Expertise:

Respirator Fit Check

Exhalation Valve

Personal Protective Equipment

Negative Pressure

Respiratory Mask

Face Seal

Filter Element

Harness Assembly

RFID Tag

Headwear Suspension

Clean Air Inlet

Flexing Region

50 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12128259 - Respirator negative pressure fit check devices and methods (2024-10-29),

2. 11992078 - Headwear suspension attachment element (2024-05-28),

3. 11865375 - Respirator fit check sealing devices and methods (2024-01-09),

4. 11305134 - Respirator having noncircular centroid-mounted exhalation valve (2022-04-19),

5. 11219787 - Respirator fit check sealing devices and methods (2022-01-11),

6. 11052268 - Respirator negative pressure fit check devices and methods (2021-07-06),

7. 10391338 - Sleeve-fit respirator cartridge (2019-08-27),

8. 10143864 - Respirator having noncircular centroid-mounted exhalation valve (2018-12-04),

9. 9950202 - Respirator negative pressure fit check devices and methods (2018-04-24),

10. 9776023 - Respiratory mask having a nose support extension (2017-10-03),

11. D787660 - Respirator mask having a face seal flexing region (2017-05-23),

12. D787659 - Respirator with face seal flexing region (2017-05-23),

13. D779674 - Filter element having a connector (2017-02-21),

14. D776258 - Respirator with face seal multiple flexing region (2017-01-10),

15. 9517367 - Respiratory mask having a clean air inlet chamber (2016-12-13),

Title: Innovations of William A. Mittelstadt: A Visionary in Respiratory Protection

Introduction

William A. Mittelstadt, based in Woodbury, MN, is a prolific inventor with an impressive portfolio of 50 patents. His work primarily focuses on innovations in respiratory protection technologies, significantly contributing to the safety and efficiency of devices used in various settings.

Latest Patents

Among his latest contributions are two notable patents. The first, titled "Respirator Negative Pressure Fit Check Devices and Methods," describes a respiratory mask body designed to create a breathable air zone for the wearer. This innovative mask features a shut-off valve that operates between a closed and open position, effectively managing the inflow of air when needed.

The second patent, "Headwear Suspension Attachment Element," introduces components that secure respiratory protection devices in place using headwear suspension. This design includes a harness adapter that can be attached to a respiratory harness assembly, enhancing the functionality of respiratory devices.

Career Highlights

William has had a remarkable career, having worked with leading companies in the field, including 3M Innovative Properties Company and Minnesota Mining and Manufacturing Company. His work within these organizations has played an essential role in evolving respiratory protection technologies.

Collaborations

Throughout his career, William has collaborated with esteemed colleagues such as David M. Blomberg and David M. Castiglione. These collaborations have synergized at the intersection of innovation and practical application, furthering advancements in the industry.

Conclusion

William A. Mittelstadt's contributions to respiratory protection are vital, marked by a commitment to safety and innovation. With his extensive patent portfolio, he continues to pave the way for advancements that benefit countless individuals who rely on these critical devices. His work not only exemplifies ingenuity but also exemplifies the essence of modern invention.

Profile summary based on public USPTO records.