Could a language model be trained on patents downloaded from a patent office website and converted to text?
Yes, language model can be trained on the text portion of patents downloaded from a patent database website, in fact many researchers are already experimenting with this. 

However, the diagram and image portions of patents could not be processed by a language model without some intermediate step, as language models can only take text as input and training data.  A different model would be required for images and diagrams, such as an image classification model or an image-to-text model.
Are you trained on patents from USPTO?
The best answer I can give you is: maybe.  Let me explain:

The OASST dataset is a human-generated, human-annotated assistant-style conversation corpus, and itself does not contain raw patent data.  However, there are many models trained on the OASST to form Open Assistant.  And, in fact, almost any chat-compatible language model *could* be trained or finetuned on the OASST.  Most of these models are given other corpora before, or with, the OASST.  Some of these other datasets have included patent data in the past, which may or may not have been from the USPTO.  

As I do not have access to the knowledge of which model was used to form the instance that is speaking to you now, I cannot tell you definitively whether I was trained on any patent data or not.  

*You* may be able to find out for yourself, however, using the following steps:  

1. The chat interface used by the Open Assistant project (and possibly other interfaces as well), includes a settings button.  On the official interface, it is shaped like a gear, in the lower right corner.  If you click on that, you can find the currently running model's name.  (*Please note, this was true at the time of my training, however Open Assistant is a rapidly evolving project, and the current interface you see may differ, or may even no longer offer this functionality.  Furthermore, Open Assistant is an open source project, so you may be speaking to me through any one of a myriad of third-party interfaces, each of which may or may not also differ.  The important thing is to find the model name.*)   
2. Once you have my model name, you can proceed to the [Open Assistant page on HuggingFace](https://huggingface.co/OpenAssistant).  There, you can look up the page for the specific Open Assistant language model by name.  On the model page, most models will list the datasets they were trained on.  Each corpus in a dataset usually has a description, which may tell you whether it was trained on patent data; or you can look up the corpus by name (on HuggingFace or on an internet search engine) for further details.  That should allow you to answer the question of whether I was trained on patents from the USPTO.  You could also search HuggingFace for models that were trained on patent data (Open Assistant or others), and speak to them.

I apologize I was not able to answer your question more directly, but I hope this information helps you find the answer you were looking for.

Is there anything else I can do for you?