A digital inventor’s notebook is a set of dated entries that record the problem, your ideas, sketches, tests and results as they happen. To make it hold up, write entries soon after the work, add to old entries instead of rewriting them, ask someone not involved to read and sign key pages if your employer or lawyer recommends it, and timestamp each exported page or batch. A TimeBind shows an exported page existed no later than the recorded time. It doesn’t show you invented anything or that it is patentable. This is general information, not legal advice.
Table of Contents
Why keep a notebook at all?
In the United States, patents have been awarded to the first inventor to file since the America Invents Act provisions took effect on 16 March 2013 (see the USPTO’s first inventor to file resources and the Federal Register notice). So a notebook doesn’t replace filing. It still helps because it can:
- show how your idea developed, step by step;
- identify who did what, when several people worked on it;
- support a conversation with a patent attorney about what to file and when;
- help show earlier use or development if a prior-use question arises (see prior user rights and the records to keep).
Other countries have different rules, so check where you plan to file.
What to put in each entry
- Date and author. Write the date in the entry, and who wrote it.
- The problem. What are you trying to solve?
- The idea or change. In enough detail that a skilled person could follow it.
- Sketches and photos. Attach them to the entry. Label them.
- Tests and results. Include failed tests. They show what you tried.
- Who else was involved. Names and what each person did.
- What’s next. The next step or open question.
Keep it append-only
Edits to old entries make a notebook harder to trust. A simple rule:
- Never delete or overwrite an entry. If you made a mistake, add a dated correction below it.
- Use a tool that keeps version history, or export each week’s entries to a PDF.
- Save the PDF with the sketches and photos for that week.
- Don’t store the only copy in one app.
Witnessing and employment
Some labs and companies ask a colleague who isn’t an inventor to read and sign pages. That is a policy choice, not a legal rule everywhere. If you invent as an employee or contractor, your agreement may say who owns inventions and which notebook to use, so follow it. A prior inventions list can help you record what you owned before a new job.
Timestamp the exported pages
TimeBinder® makes a fingerprint in your browser and the file stays on your device. A good routine:
- Export the week’s notebook pages as a PDF.
- Put the PDF, sketches, photos and any CAD files in one TimeBind (up to 10 files). See how to timestamp a file.
- Keep the Proof of Time Certificate with the export.
- Do the same before any disclosure. See NDA and a timestamp before disclosure.
For the bigger picture, see prove you invented something first, invention records and timestamping and provisional patent vs timestamp.
If AI will assist the next invention or product-design step, see also the free AI-assisted invention record checklist. It looks at the exact files from before an upload, the current terms, and the copy you will file or share. It cannot decide inventorship, and it is not legal advice.
Frequently Asked Questions
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Do I still need a notebook if I plan to file a patent?
Filing is what matters most in a first-to-file system, but a notebook records how the idea developed and who did what, and helps your attorney understand the history.
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Does a digital notebook count as evidence?
It can be evidence. How much weight it gets depends on the case. Entries that are dated, detailed, append-only and supported by independent records are easier to rely on.
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Do I need someone to witness my notebook?
Not everywhere, and not always. Some employers and labs require it. Ask your attorney or employer what they expect.
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Can a timestamp show I invented something?
No. It shows that the exact file existed no later than the recorded time and still matches its fingerprint. Who invented something depends on other evidence and the law.
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What does a TimeBind cost?
Your first Pooled TimeBind is free, with no credit card required. After that, Pooled TimeBinds start from US$5, and an ASAP TimeBind is US$15. See plans and pricing
Start the record this week
Free to start. The file stays on your device and your browser makes the fingerprint.
Last fact-checked: 10 November 2026.
Date this week’s notebook entries
Export your notebook pages and add them, with sketches and test photos (up to 10 files), to one TimeBind.
Make your first TimeBind free → See plans and pricing
Your first Pooled TimeBind is free, with no credit card required. After that, TimeBinds start from US$5, and an ASAP TimeBind is US$15. Your browser makes the fingerprint and the file stays on your device. A TimeBind shows a file existed no later than the recorded time. It doesn’t show who made it.
