@Grivusangel -- I have to say it sounds like you might have a case, since you have the equivalent education and much more experience. It's a shame no one has recognized your company loyalty.
The equal pay for equal work concept has been kicking around in US society for as long as I can remember. It's tied into other concepts like the glass ceiling for women -- that women are only being promoted so far in certain companies.
I think the law should require that every management employee should have his or her salary and years of experience available to any employee who asks, as well as the hourly pay, experience and gender of every employee in the company. Hourly employees need not be named specifically, but their pay should be publicly posted in an email or other means so every employee would know the salary structure of the company and whether their pay was fair considering their experience and time with the company.