Location History:
- Walthan, MA (US) (2011)
- Waltham, MA (US) (1997 - 2019)
Company Filing History:
8 out of 41 
4 out of 2,176 
1 out of 1,405 
Years Active: 1997-2019
Title: Innovations by Tung-Feng Yeh in Forensic Document Security
Introduction
Tung-Feng Yeh is a notable inventor based in Waltham, MA, with a remarkable portfolio of 15 patents. His work primarily focuses on enhancing the security of documents through innovative forensic features. Yeh's inventions are designed to provide reliable verification methods for secure documents, making significant contributions to the field of document security.
Latest Patents
One of Yeh's latest patents involves a forensic feature for secure documents. This feature comprises a base document layer and a covert material applied to it. The covert material includes a carrier and forensic material, which consists of a ratio of salts or oxides of metals, including rare earth metals. This ratio is selected to correspond with the source of the document. The forensic material can be mixed into a coating or ink applied at predetermined locations on the secure document. The ratio is measurable from metal ion signals of the salts or oxides, allowing for document verification. Another aspect of this invention includes a forensic metric measurable from a covert material in the document, which corresponds to the document's source. A blocking layer is applied over the covert material to prevent access, requiring at least partial destruction of the document to measure the forensic metric. This blocking layer can block electromagnetic waves, ensuring the covert material remains secure until verification is needed.
Career Highlights
Throughout his career, Tung-Feng Yeh has worked with prominent companies such as L-1 Secure Credentialing, Inc. and Polaroid Corporation. His experience in these organizations has contributed to his expertise in document security and forensic technology.
Collaborations
Yeh has collaborated with notable individuals in his field, including Robert L. Jones and Daoshen Bi. These collaborations have likely enriched his work and led to further advancements in his inventions.
Conclusion
Tung-Feng Yeh's contributions to forensic document security through his innovative patents demonstrate his significant impact on the industry. His work continues to pave the way for enhanced security measures in document verification.