About Us

We are X-Tirp Inc. We started the company in Portland, Oregon, with a mission: extirpate invasive species. There are two of us, Phil Doberenz, Inventor and Chief Technical Wizard, and Tammy Evans, President.

How do you Invent an Ivy-Ripper?

The answer is: You Care.

You spend a lot of time on it. Invest your life savings in it.

You do it because you care about how we humans have planted it and by letting it get away, have altered our landscapes, and you want to be a part of restoring them.

You do it because you’ve been out there on cold Saturday mornings with your neighbors cutting and pulling the ivy by hand and feeling the futility of trying to save the trees it is climbing – and snuffing.

You do it once and fail.

Do it again – and fail. And again… and keep that up until you learn how the tool has to work and what you have to grind, drill, mold, and cast to make the parts, one by one.

Then you assemble them, and you test and test.

You squeeze the costs wherever you can – and the time it takes to cast and finish the parts.

Some tests work better than others. Some parts break or clot up with dirt and twigs.

Some people who volunteer to test are more impressed than others. You write down their criticisms and try again – grind, drill, mold, and cast.

                     And sometimes it just rains.

But eventually, after you have simplified drastically, you get one that works – even works well. And you want to let the world know about it.

So we are. Now You can sign up on our  Contacts Page and get updates about the new Ivy-Ripper v. 14.2. And if you are in the Pacific Northwest (US), ask for a free demonstration.

Bio of Phil Doberenz, CEO and Chief Technical Officer

Phil Doberenz set out to invent tools to reverse the spread of invasive species – all kind

Since then he has also been selected as a Runner Up in the contest sponsored by the Michigan Department of Fish and Wildlife for a sonic device to prevent Asian Carp from invading the Great Lakes.

Phil lives in Tigard, Oregon, a suburb of Portland, where we make the Ivy-Ripper.

Now, after 13 versions of the Ivy Ripper that have grown progressively more complex, he has radically simplified its design and is producing the Ivy Ripper v. 14.2, fabricating it part by part, some sheet metal, some 3-D printed, some molded fiberglass, and the tether from Dyneema, a fabric stronger than steel. As of October 19, 2018, he filed for a patent on Ivy-Ripper version 14.2. I

As we were testing the Ivy Ripper, a staff member of the Portland No Ivy League discovered that it also works on Himalayan blackberries and other invasive species. Its advantage is that the operator can tear out stems and roots without reaching into the thorns and getting scratched.
We have begun posting photos and videos of our tool that show it in operation. We invite people near us (in the Pacific Northwest) who have signed up through our Contact Us page to test it on their own sites.