Present Perfect Tense with State Verbs

I would not use these sentences as they are, but I might use that construction in a longer sentence:

• “I have known about her goodness for several years.”
• “I have sometimes known her name, but I never remember it for long.” (This is somewhat humorous.)
• “I have often thought it would be fun to learn woodworking.” (The thought comes to me often, but I do not always have that thought.)

I cannot clearly say why, but for these verbs this tense demands a specification of time: either a duration (continuing into the present), as in my first example, or a set of discrete moments, as in my others.