I thought… “I keep changing the features in my product; therefore I cannot afford to patent each and every change in the product”
It is not necessary to file a patent application for each and every change to your product for which an initial patent application (first application) has been filed, PROVIDED that the initial patent had anticipated the likely changes, improvements or modification that could be made to the product and the likely possible changes, improvements or modifications had been included in the patent claims.
The basic patent would be infringed even with the addition of the new features. So you need not worry about filing for a new patent for new features. But if the first did not anticipate the possible changes that can be incorporated into the product, then you have to consider seriously whether a new patent for the improved product needs to be filed to protect the “new” product.
It is advisable to consult a patent expert to decide whether you need to file a new patent application or whether the first patent is sufficient.
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