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1answer
25 views

Is US 4,915,276 A still owned by Ermin Devito?

In reference to the patent: US 4,915,276 A Is this patent still owned by Ermin Devito or somebody else? If it is, how can it be re-claimed by him or his family?
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1answer
57 views

Does LEGO own patent US 8,292,744 B2?

In reference to the patent: US 8,292,744 B2 It looks like LEGO so I need to know if they own it or not.
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1answer
34 views

US 2,038,852 A (April 1936) - Who was the manufacturer?

US 2,038,852 A This is a kitchen sink strainer system. How do I find out the manufacturer or supplier of this patent or find out if the product is still manufactured?
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2answers
67 views

How can I determine the date of a patent sale?

My great grandmother Lizzie M. Adams sold her patent (number 680,106) to C. H. Munson in the early 1900s, I think. I have a newspaper article of the sale but no date.
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3answers
155 views

How big is the US patent market in Virtual Reality patents?

I'm trying to work out how many virtual reality patents are assigned each year, and how the size of the market has changed. I also want to work out how many patents are reassigned each year, and how ...
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1answer
136 views

Why are the assignors of a patent not necessarily identical with previous assignees?

When I researched the assignment history of a patent I found one assignment (from assignor A to assignee B) and a later assignment (from assignor B and C to assignee D). Where does C come from?