PATENT SOLUTIONS
Proofreading and Patent Term Adjustment (PTA)
Patent proofreading and PTA support designed to improve patent and publication accuracy and help teams identify potential patent term adjustment issues.

HOW IT WORKS
From issued patent to a clean certificate
The same sequence on every engagement, in your system, to your rules.
- 01
Intake of the issued patent
The granted patent, allowed claims and file history are collected.
- 02
Proofreading
Claims, specification, drawings and bibliographic data are compared line by line to the allowed text.
- 03
PTA review
The patent term adjustment calculation is checked against the prosecution timeline.
- 04
Report
Errors and PTA discrepancies are reported with the certificate-of-correction or petition options.
What it does
Post-allowance and issued-patent review can require detailed document checks and careful analysis of the prosecution record. Discrepancies between approved materials and the issued patent, along with potential patent term adjustment issues, can be difficult to identify and may require additional attorney time to investigate.
Trexo acts as a pressure release valve for patent review work, taking on detailed document checks that can consume valuable attorney and paralegal time. Our proofreading service identifies discrepancies, inconsistent claim dependencies, numbering issues, and typographical errors in patent documents. Our PTA calculation service reviews A, B, and C delays to identify potential patent term adjustment issues. Findings are clearly documented so the responsible team can assess and address discrepancies efficiently.
Support is available without a subscription or organization-wide commitment. A single attorney, client, or IP team can send Trexo as much or as little review work as needed. This provides additional capacity when review workloads increase without adding ongoing costs when that support is no longer needed.
Key capabilities
Proofread published applications or issued patents against source application materials
Identify typographical, bibliographic, and formatting discrepancies
Support review of PTA-related prosecution events and calculations
Maintain review status and issue tracking
Prepare clear reports for attorney or client review
THE OUTCOME
What Proofreading and Patent Term Adjustment (PTA) changes
Consistent post-issuance review
Clearer visibility into document and PTA issues
Faster identification of discrepancies
Reduced attorney review and administrative effort
IN THEIR WORDS
“Trexo Global has revolutionized our IP operations department. They go beyond being a service provider and are a true partner to Womble Bond. With Trexo’s help, we’ve been able to streamline IP administrative tasks across the practice group, which has resulted in lower costs, increased capacity, faster turnaround time, and fewer errors. I would urge any IP department which is looking to make their group more efficient to work with Trexo Global.”
Sherri Jarrell, Director of IP Operations
Womble Bond Dickinson (US) LLP
Who it’s for
- IP law firms
- Corporate IP teams
- Paralegal teams
- IP operations teams
- Life sciences companies
COMMONLY ASKED QUESTIONS
About Proofreading and Patent Term Adjustment (PTA)
What does your patent proofreading review cover?
We proofread issued patents against the source application materials and identify typographical, bibliographic, and formatting discrepancies. Status and open issues are tracked throughout, and findings are prepared as clear reports for attorney or client review.
Do you proofread issued patents against the application?
Yes. The review compares the issued patent against the relevant application or approved materials, which is how discrepancies introduced during prosecution or printing get surfaced.
Can you identify potential PTA issues?
We support review of PTA-related prosecution events and calculations, and document what we find. The assessment and any resulting action stay with the team responsible for the matter.
How are proofreading findings reported?
Findings are documented clearly and prepared as reports for attorney or client review. Review status and open issues are tracked, so it is clear what has been examined and what still needs a decision.
Can the review follow our existing SOP?
Yes. The review is structured around your existing process rather than a fixed template, including how issues are categorised and how findings are reported back.
Does our entire firm need to agree to use your proofreading or PTA services?
No. While we can support the entire firm, we can also work for individual attorneys or clients. We only bill for the work you send us, so you’re able to use us when the need arises but not pay for our services when you do not.
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Ready to talk about your portfolio?
Contact us and we will walk through your process, not a generic script.
