Quote Originally Posted by amber View Post
On the bottom of the 3" tab container & the energizer tablet container it says Pat# 4,732,288 & Other Pat Pending 4,967,926.
Wow! PPG claims their "Sustain Summer Shield Chlorine Extender is the brains of the Sustain System. It's not only smart, but unique to PPG, protected by a U. S. Patent."

But here are the patent numbers you provided:
http://www.google.com/patents/US4732288 : "Child-resistant molded plastic container lid for open head containers"
http://www.google.com/patents/US4967926 : "Child-resistant molded plastic container lid for open head containers"

No patents for chemistry. How bogus!

If you could, do this:
1. Check the Shield container, again, just to be 100% there is no patent listed.
2. If not, call the customer service number on the container, if any, and ask them. OR use this contact form: http://www.ppg.com/chemicals/askjoep...contactus.aspx

Say something like this, "I use the Sustain system, but it's kind of expensive, and I'm being told that it's probably a bogus system, and not worth the money. They said the patent numbers listed were for the CONTAINERS, and not the chemicals, and that you may not really have patented chemicals. Can you tell me what the Sustain patent number is?"

That will freak them out, and is much more likely to get a response, then if I ask.