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Forward Citations = 24

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5 inventors (with patents filed for the assignee):

Wolfgang Kroner (5 out of 6 patents)

Wolfgang Burkhardt (2 out of 10 patents)

Wolfgang Kroener (2 out of 4 patents)

4. Gerhard Rupprecht (1 out of 1 patent)

5. Hans-Georg Schnell (1 out of 1 patent)

10 patents: Sort by Forward Citations

1. 4970709 - Watch hand adjustment gear (1990-11-13),

2. 4860270 - Drive coupling (1989-08-22),

3. 4722076 - Arrangement for limiting the axial play of gears of a watch time (1988-01-26),

4. 4719609 - Hour gear structure of a watch (1988-01-12),

5. 4719368 - Power supply control arrangement for a watch stepping motor (1988-01-12),

6. 4704037 - Watch operating mechanism mounting arrangement (1987-11-03),

7. 4703208 - Wristwatch stepping motor (1987-10-27),

8. 4671670 - Wristwatch (1987-06-09),

9. 4652142 - Watch drive (1987-03-24),

10. 4626109 - Watch hand drive shaft structure (1986-12-02),

Pforzheimer Uhrenrohwerke Porta GmbH is a leading manufacturer of clock movements and components. With over 50 years of experience, we provide high-quality and precision-engineered products for the clock industry. Our state-of-the-art facility in Germany ensures top-notch craftsmanship and innovation. We offer a wide range of clock movements for various applications, from traditional grandfather clocks to modern wall clocks. Our commitment to excellence and customer satisfaction sets us apart in the industry.

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USPTO Data Jan 1 1976 - Dec 9 2025

10 Patents

#9 in Pforzheim

#3,713 in Germany

#54,238 in the World

Pforzheim, Germany

Pforzheimer Uhrenrohwerke Porta Gmbh