PTA needs to be available in non-US matters
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The PatentTermAdjustment field is (I think) only shown for applications that have the United States as Country. However, China is implementing a PTA-like system and PTA will thus be a datapoint that needs to be entered for Chinese patent applications.
It appears that other countries offer PTA as well, including, for example:
South Korea
Singapore
Nicaragua
Honduras
Guatemala
El Salvador
Dominican Republic
Costa Rica
Colombia
ChileThe PTA field should, I think, just be made available globally.
Cheers,
Christian