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Hi Pete:

There are a number of ways.

In general there are two search engines.? The USPTO and Google.

The good news is that Google has used Optical Character Recognition (OCR) and so you can search all of their data base for any word anywhere.
The bad news is that Google has used Optical Character Recognition which has many mistakes, so there are odds associated with any search.
- this is the basic patent number search and for United States patent number the first two characters need to be US.
At the bottom of that page there's a link to the Advanced Search where you have a lot more options.
The Google patent result pages can be trimmed back so that they end with the patent number, a very convenient situation.

The USPTO has a number of web pages for searching.? But they use .tif format for the patents, i.e. no OCR and the searches can only be done on the fields they have digitized.
This is the patent number search (good for getting class numbers):
This is the Quick search:?
Notice the select years drop down box.? When you select 1976 to present there are many more fields available to search.
When 1790 to present there are fewer fields available.? There was a patent office fire in 1836 so some patents are no longer available.
The URL for a search result is not permanent nor is the result of a patent number search.

ALL patents are issued on a Tuesday.? So? you can check? a patent date using a Calendar to confirm the patent is on a Tuesday.? If the date is not on a Tuesday there's a typo.

My web pages are filled with patents on all kinds of things including HP instruments.? Here's an old list:


And a general discussion:


I used to visit the Sunnyvale, California patent office and it turns out they are the only one where the patents are filed by Class/Sub-class numbers.? NOT in patent number order.
This allows for easy searching once you know the class numbers for the general area.


If you let me know more specifics I may be able to help.

-- 
Have Fun,

Brooke Clarke, N6GCE

axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.