On Fri, 18 Sep 2026 15:36:33 +1000, Bill Sloman wrote:It's frequently helpful to have a working example. The counter-current continuous digestor was quite a tricky design - which is why Johan Richter could never get any of his versions to work - and potential users would set set up industrial scale trials.
It didn't stop him getting an international patent onBut you don’t need to prove something works before getting a patent.
counter-current continuous cooking, where you convert wood chips
into paper pulp by letting them fall down through a rising stream of
sodium hydroxide. solution. We did get international visitors. One
was
>
https://en.wikipedia.org/wiki/Johan_Richter_(inventor)
>
who'd invented the concurrent continuous digestor that my father
eventually modified for counter-current operation. Johan had tried
for some ten years to get it to work counter-current, and his
company (Kamyr) never paid any royalty on my father's patent, though
the industry adopted the process very rapidly.
'
The provisional patent I'm working on is a lot simpler, and won't need a working example.
Thomas Edison put together the first working electric light-bulb. DidWho'd done quite a much development work as Thomas Edison.
he get the patent on it? No, because that was already taken by Joseph
Swan.
Both inventors patented much the same invention at much the same time, and found it expedient to set up a joint company to exploit them.
https://en.wikipedia.org/wiki/Joseph_Swan
--
Bill Sloman, Sydney
| Date | Sujet | # | Auteur | |
| 18 Sep 26 |  Re: Patents (was Re: google reads your mail) | 6 | Lawrence D’Oliveiro | |
| 19 Sep 26 |  Re: Patents (was Re: google reads your mail) | 5 | Bill Sloman | |
| 19 Sep 26 |  Re: Patents (was Re: google reads your mail) | 4 | Lawrence D’Oliveiro | |
| 20 Sep 26 | Re: Patents (was Re: google reads your mail) | 3 | Bill Sloman | |
| 20 Sep 26 | Re: Patents (was Re: google reads your mail) | 2 | Lawrence D’Oliveiro | |
| 20 Sep 26 |  Re: Patents (was Re: google reads your mail) | 1 | Bill Sloman |
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