Fluidic conductive trace based radio-frequency identification

Patent metadata

Field	Value
Publication number	US-11423277-B2
Application number	US-201716076273-A
Country	US
Kind code	B2
Filing date	Feb 7, 2017
Priority date	Feb 7, 2017
Publication date	Aug 23, 2022
Grant date	Aug 23, 2022

Abstract

In some examples, a fluidic conductive trace based radio-frequency identification device may include a flexible substrate layer including a channel, and a trace formed of a conductive fluid that is disposed substantially within the channel. The fluidic conductive trace based radio-frequency identification device may further include a sealing layer disposed on the flexible substrate layer and the trace to seal the conductive fluid in a liquid state within the channel.

First claim

What is claimed is:

1. A radio-frequency identification device comprising:
a substrate layer including a channel;
a trace formed of a conductive fluid that is disposed substantially within the channel, wherein the conductive fluid in the channel includes deionized water having a predetermined conductivity; and
a sealing layer disposed on the substrate layer and the trace to seal the conductive fluid in a liquid state within the channel, wherein the sealing layer has a specific diffusion material property that interacts with the deionized water in the channel to reduce the predetermined conductivity of the deionized water in the channel over a predetermined time period.

2. The radio-frequency identification device according to claim 1 , wherein the predetermined conductivity of the deionized water is determined based on a predetermined conductive fluid property, and
the predetermined conductive fluid property includes a predetermined change over the predetermined time period based on an interaction of the conductive fluid with the sealing layer.

3. The radio-frequency identification device according to claim 1 , wherein the substrate layer is a flexible material.

4. The radio-frequency identification device according to claim 1 , wherein the substrate layer is a rigid material.

5. The radio-frequency identification device according to claim 1 , wherein the sealing layer includes a porosity that causes evaporation of the conductive fluid.

6. The radio-frequency identification device according to claim 1 , wherein the sealing layer absorbs conductive ions in the deionized water to reduce the predetermined conductivity of the deionized water over the predetermined time period.

7. The radio-frequency identification device according to claim 1 , wherein the trace includes a configuration that causes generation of an indication of a predetermined attribute of the radio-frequency identification device based on a state of the conductive fluid during actuation of the radio-frequency identification device.

8. The radio-frequency identification device according to claim 1 , wherein the trace includes a configuration that causes generation of an indication of a predetermined attribute of a product associated with the radio-frequency identification device based on a state of the conductive fluid during actuation of the radio-frequency identification device.

9. A radio-frequency identification device comprising:
a substrate layer including a channel;
a first trace formed of a conductive fluid that is disposed substantially within the channel, wherein the conductive fluid in the channel includes deionized water having a predetermined conductivity;
a second trace formed of a metallic material on the substrate layer; and
a sealing layer disposed on the substrate layer and the first trace to seal the conductive fluid in a liquid state within the channel, wherein the sealing layer has a specific diffusion material property that interacts with the deionized water in the channel to reduce the predetermined conductivity of the deionized water in the channel over a predetermined time period.

10. The radio-frequency identification device according to claim 9 , wherein the sealing layer is disposed on the substrate layer and the second trace.

11. The radio-frequency identification device according to claim 9 , wherein the substrate layer is a flexible material.

12. The radio-frequency identification device according to claim 9 , wherein the sealing layer includes a porosity that causes evaporation of the conductive fluid.

13. A method for forming a radio-frequency identification device, the method comprising:
imprinting a channel partially into a substrate layer by using a roller;
forming a trace by depositing a conductive fluid into the channel, wherein the conductive fluid in the channel includes deionized water having a predetermined conductivity; and
sealing the conductive fluid in a liquid state within the channel by placing a sealing layer on the substrate layer and the trace, wherein the sealing layer has a specific diffusion material property that interacts with the deionized water in the channel to reduce the predetermined conductivity of the deionized water in the channel over a predetermined time period.

14. The method according to claim 13 , further comprising:
configuring the trace to generate an indication of a predetermined attribute of the radio-frequency identification device based on a state of the conductive fluid during actuation of the radio-frequency identification device.

15. The method according to claim 13 , further comprising:
configuring the trace to generate an indication of a predetermined attribute of a product associated with the radio-frequency identification device based on a state of the conductive fluid during actuation of the radio-frequency identification device.

Assignees

• Hewlett Packard Development Co

Inventors

• Ge Ning
• Wittkopf Jarrid
• Ionescu Robert
• Holder Helen A
• Mazurkiewicz Paul Howard

Classifications

• H05K1/0393

  Flexible materials (H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups) · CPC title

• H05K1/092

  Dispersed materials, e.g. conductive pastes or inks · CPC title

• H05K3/107

  by filling grooves in the support with conductive material (H05K3/045, H05K3/101, H05K3/1258 and H05K3/465 take precedence) · CPC title

• H05K2201/10098

  Components for radio transmission, e.g. radio frequency identification [RFID] tag, printed or non-printed antennas · CPC title

• H01Q7/00

  Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop · CPC title