launderess
Well-known member
Yes, they do
While yes, the original patent does expire in twenty years; inventor can file again claiming "improvement", which starts the clock all over again. Well assuming the new patent is granted. https://patents.stackexchange.com/questions/10441/how-can-you-renew-an-expired-patent
Over the years P&G not only have improved their activated bleaching system, but the detergent powders it goes into as well.
Thus it isn't just the bleaching activator someone would need; but a formula for a powdered detergent that incorporated same *and* performed same or better as TWB.
Think this is original patent: https://patents.google.com/patent/US4087369A/en
Then came another in 2003:https://patents.google.com/patent/US20040142844A1/en
From 1991: https://patents.google.com/patent/WO1992013798A1/en
More: https://patents.google.com/?inventor=Gerard+Marcel+Baillely
It isn't just the bleaching activator per se; but how things all come together to make a detergent that will perform as expected consistently.
Here is MSDS for the old Biz (by P&G)
https://hpd.nlm.nih.gov/cgi-bin/household/brands?tbl=brands&id=16003096
If you click onto "Color Safe Bleach....." you get a listing of other activated oxygen bleach detergents/bleaches; all are P&G brands.
https://hpd.nlm.nih.gov/cgi-bin/household/brands?tbl=chem&id=1534
Here is the MSDS for a version of TWB powder: https://hpd.nlm.nih.gov/cgi-bin/household/brands?tbl=brands&id=16030569
If you click on "Nonanoyloxy Benzene Sulfonate", the only products that have it are all from P&G (Tide).
P&G's (2008) purchase agreement: https://www.sec.gov/Archives/edgar/data/1337298/000106880008000357/ex10p7.htm
[this post was last edited: 6/13/2018-06:35]
While yes, the original patent does expire in twenty years; inventor can file again claiming "improvement", which starts the clock all over again. Well assuming the new patent is granted. https://patents.stackexchange.com/questions/10441/how-can-you-renew-an-expired-patent
Over the years P&G not only have improved their activated bleaching system, but the detergent powders it goes into as well.
Thus it isn't just the bleaching activator someone would need; but a formula for a powdered detergent that incorporated same *and* performed same or better as TWB.
Think this is original patent: https://patents.google.com/patent/US4087369A/en
Then came another in 2003:https://patents.google.com/patent/US20040142844A1/en
From 1991: https://patents.google.com/patent/WO1992013798A1/en
More: https://patents.google.com/?inventor=Gerard+Marcel+Baillely
It isn't just the bleaching activator per se; but how things all come together to make a detergent that will perform as expected consistently.
Here is MSDS for the old Biz (by P&G)
https://hpd.nlm.nih.gov/cgi-bin/household/brands?tbl=brands&id=16003096
If you click onto "Color Safe Bleach....." you get a listing of other activated oxygen bleach detergents/bleaches; all are P&G brands.
https://hpd.nlm.nih.gov/cgi-bin/household/brands?tbl=chem&id=1534
Here is the MSDS for a version of TWB powder: https://hpd.nlm.nih.gov/cgi-bin/household/brands?tbl=brands&id=16030569
If you click on "Nonanoyloxy Benzene Sulfonate", the only products that have it are all from P&G (Tide).
P&G's (2008) purchase agreement: https://www.sec.gov/Archives/edgar/data/1337298/000106880008000357/ex10p7.htm
[this post was last edited: 6/13/2018-06:35]