Patents are expensive, valuable business properties. They're expensive to get and very expensive to enforce. If you're thinking of making relatively inexpensive things in relatively low quantities, it's probably not worth getting one or more patents to protect them. If you're thinking of seeking venture capital and going bigger, patents (or at least starting the process) is probably essential to attracting capital.
As for several big countries, you have one year from your filing in the US to file in other countries for the same invention. That give you and any investors time to think about it. My general recommendation is to only file in countries in which you have some sort of presence to protect and resources to maintain a large litigation. You can spend a lot of money applying for patents overseas with little or no benefit.
Oh, and quality matters ... a lot. There's no partial credit. Either you've complied with the law and covered your competitors products/services or you haven't. There's no in between.
Best of luck.
As for several big countries, you have one year from your filing in the US to file in other countries for the same invention. That give you and any investors time to think about it. My general recommendation is to only file in countries in which you have some sort of presence to protect and resources to maintain a large litigation. You can spend a lot of money applying for patents overseas with little or no benefit.
Oh, and quality matters ... a lot. There's no partial credit. Either you've complied with the law and covered your competitors products/services or you haven't. There's no in between.
Best of luck.