Prior art

The user asked me to find relevant prior art for US patent 10628820 by looking at its citations, and to provide the full citation, publication/filing date, brief description, and potential anticipating claims for each.

The patent US10628820B2 "Multi-function electronic payment device" explicitly identifies its chain of related applications in the "RELATED APPLICATIONS" section:
"This is a Continuation application of, commonly-owned U.S. patent application Ser. No. 15/250,698, now U.S. Pat. No. 10,013,693, filed Aug. 29, 2016, which in turn was a continuation of U.S. patent application Ser. No. 14/680,946, now U.S. Pat. No. 9,430,765 entitled “MULTI-FUNCTIONAL CREDIT CARD TYPE PORTABLE ELECTRONIC DEVICE,” filed Apr. 7, 2016 to inventor David Wyatt, which is itself a continuation of U.S. patent application Ser. No. 14/217,261, now U.S. Pat. No. 9,022,286, similarly entitled “MULTI-FUNCTIONAL CREDIT CARD TYPE PORTABLE ELECTRONIC DEVICE,” filed Mar. 17, 2014 by the same inventor David Wyatt, and claims the benefit of U.S. Provisional Patent No. 61/794,891 entitled “Multi-Functional Credit Card Device,” filed Mar. 15, 2013 to inventor David Wyatt. The benefit of the earlier filing dates is hereby claimed and the contents of the earlier filed related applications are further incorporated by reference in their entirety."

Therefore, the most relevant prior art documents (as direct predecessors in the patent family) are:

1. U.S. Pat. No. 10,013,693

   • Full Citation: U.S. Pat. No. 10,013,693 to David Wyatt, titled "Multi-function electronic payment device."
   • Publication/Filing Date: Filed August 29, 2016. Published July 3, 2018.
   • Brief Description: As a direct continuation of patents with similar titles, this patent likely describes an electronic device resembling a credit card that can emulate standard credit card magnetic stripe functionality by generating a programmed magnetic field, with features such as storing multiple accounts, user interfaces for selection, motion detection for adjusting magnetic field generation speed, and security features including limited-duration credit card numbers. It likely further refines or expands on the concepts introduced in its predecessors, such as methods for transaction processing, card-to-card transactions, and various security enhancements.
   • Potential Anticipation (35 U.S.C. § 102): Since US10628820 is a continuation of US10013693, it is highly probable that US10013693 discloses many, if not all, of the foundational elements present in the claims of US10628820. Claims in US10628820 would differentiate themselves by specific improvements, combinations of features, or novel applications of the previously disclosed concepts. Therefore, US10013693 would potentially anticipate claims in US10628820 that lack sufficient novelty and non-obviousness over the earlier disclosure. Without a detailed claim comparison, it's not possible to list specific claims.

2. U.S. Pat. No. 9,430,765

   • Full Citation: U.S. Pat. No. 9,430,765 to David Wyatt, titled "MULTI-FUNCTIONAL CREDIT CARD TYPE PORTABLE ELECTRONIC DEVICE."
   • Publication/Filing Date: Filed April 7, 2016. Published August 30, 2016.
   • Brief Description: This patent likely describes an electronic credit card-like device capable of emulating a standard credit card. Key features would include a dynamic magnetic strip via an inductor assembly, a processor to control magnetic field generation, memory for storing multiple accounts, a user interface for account selection, and mechanisms to detect the speed of a card swipe to appropriately time the magnetic field data output. It also likely covers initial concepts for security, such as dynamic card numbers.
   • Potential Anticipation (35 U.S.C. § 102): US9430765, as a parent continuation application, would likely disclose the core functionality and components of a multi-function electronic payment device that emulates a magnetic stripe. Claims in US10628820 that describe the fundamental aspects of magnetic stripe emulation, multiple account storage, or basic user interaction would potentially be anticipated by US9430765 if they are not sufficiently distinct.

3. U.S. Pat. No. 9,022,286

   • Full Citation: U.S. Pat. No. 9,022,286 to David Wyatt, titled "MULTI-FUNCTIONAL CREDIT CARD TYPE PORTABLE ELECTRONIC DEVICE."
   • Publication/Filing Date: Filed March 17, 2014. Published May 5, 2015.
   • Brief Description: This is an earlier iteration of the multi-functional credit card device. It would describe the fundamental concept of a card-shaped electronic device that can generate a dynamic magnetic field to emulate a traditional magnetic stripe. It would also likely introduce the idea of a processor, memory, and sensors to detect motion and control the magnetic field output rate. Security concepts, such as generating unique or limited-use card numbers, would also likely be present at a foundational level.
   • Potential Anticipation (35 U.S.C. § 102): As an even earlier patent in the family, US9022286 would contain disclosures that are foundational to the technology claimed in US10628820. Any broad claims in US10628820 that cover the basic structure and function of a dynamic magnetic stripe emulation card, multi-account storage, or fundamental security mechanisms (like limited-use numbers) would likely find their elements disclosed in US9022286.

4. U.S. Provisional Patent No. 61/794,891

   • Full Citation: U.S. Provisional Patent No. 61/794,891 to David Wyatt, titled "Multi-Functional Credit Card Device."
   • Publication/Filing Date: Filed March 15, 2013.
   • Brief Description: Provisional patent applications establish an early filing date and describe the invention, though they are not formally examined. This provisional application would have been the earliest disclosure of the core inventive concepts of the multi-function electronic credit card device, including the idea of a device that can dynamically emulate a magnetic stripe for payment transactions. It would lay the groundwork for the subsequent non-provisional applications and patents.
   • Potential Anticipation (35 U.S.C. § 102): While a provisional application is not a patent, its disclosure can serve as prior art for later-filed non-provisional applications that claim its benefit. The disclosure of US61/794,891 would encompass the earliest publicly available description of the "Multi-Functional Credit Card Device." Therefore, any claims in US10628820 that are fully disclosed and enabled by the provisional application's content would be anticipated by this earlier filing, establishing the earliest effective priority date for the common subject matter.

It's important to note that since US10628820 is a continuation application, it inherently builds upon the disclosures of these earlier patents. Therefore, these prior art documents primarily serve to establish the priority date and define the incremental advancements claimed in US10628820, rather than necessarily anticipating all its claims without modification. Claims in continuation patents are typically drafted to be novel and non-obvious over the parent applications. A full anticipation analysis under 35 U.S.C. § 102 would require a detailed, side-by-side comparison of each claim of US10628820 against the complete disclosure of each prior art document.