? identify this mysterious Kodak developer recipe

Photographic developer for direct production of equidensity images on a high contrast film

United States Patent 6083671 (includes recipe) is interesting [makes me wonder what it's common name is] { not D-19 }

Formulation 1
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Water, distilled 500 cc (about 18-24° C.)

Sodium Sulfite anhydrous 18.0 grams

2-Chlorohydroquinone 5.0 grams

Sodium Metaborate tetrahydrate 40.0 grams

Boric Acid 2.5 grams (approximate, see below)

1-Allyl-2-thiourea 0.75 grams

Water, distilled, to make 1000 cc

Formulation 2

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Solution A

Water, distilled (30-40° C.) 400 cc

Sodium Sulfite anhydrous 63.0 grams

2-Chlorohydroquinone 17.5 grams

Water, distilled, to make 500 cc
***********************
Solution B

Water, distilled (30-40° C.) 350 cc

Sodium Metaborate tetrahydrate 140.0 grams

1-Allyl-2-thiourea 2.70 grams

Water, distilled, to make 500 cc
***********************
Solution C

Boric Acid 10 grams

Water, distilled (30-40° C.) to make 250 cc

Dennis I have almost all Kodak's published formulae in my Database but none with Thiourea of any type. But then Kodak didn't publish every commercial developer formulae.

Ian