Pamela - thank you very much for your interesting comments about your tea warmers (stövchen). I will look forward to seeing your photos of them.
I note the Inwald tea warmer you mentioned. It can be seen in Heacock's Collecting Glass
Vol 3. 1986. Page 78, table 117. There is another one shown in the same 1986 volume which is surely the one Ivo's grandmother had - Jacobean pattern, page 74, table 99.
I must admit to being a little confused about your notes regarding Rindskopf and your references to PK 2002 and 2003. The discovery of Rindskopf as a major manufacturer of Carnival Glass was mine
(2000). First published in our A Century of Carnival Glass
(Schiffer 2001, though actually released late 2000). Also recorded in various Carnival Glass journals in 2001; further information in Czechoslovakian Carnival Part One: Inwald & Rindskopf
(Thistlewood, 2002) and updated to include much photographic evidence about the Rindskopf factory on my website here > http://www.geocities.com/carni_glass_uk_2000/RindskopfHome.html
And in your point 3 you wrote "an important share of iridised glass from these manufacturers was exported to England"
Yes, I know that. The research is mine. I have documented it, written about it and lectured on it.
Czech Carnival (from both Rindskopf and Inwald) is found in the UK, mainland Europe (Belgium and France have produced some great items) the USA, Australia and South America.
Interestingly, the "Inverted Prisms" tea warmer that is the subject of this thread, was actually found in Oklahoma, USA (I purchased it from there). I have since discovered that another one (without the metal top) was found in Pennsylvania, USA. I am not aware of any tea warmers being found in the United Kingdom.
I'm glad you agree with me that my tea warmer looks like Rindskopf. It is undoubtedly theirs, in my opinion. However I must disagree with you regarding your final comment in which you noted that "IMHO your DRGM patented the PATTERN, not the shape or usage"
. That doesn't follow to me. Why would only this shape have the DRGM on? No other items that I am aware of in Rindskopf's "Inverted Prisms" pattern have DRGM on them. If the patent was for the pattern then it would be on other shapes in the "Inverted Prisms" range - and it isn't. In fact I am not aware of any other Carnival items from Rindskopf (or anyone else) that bears the DRGM. The only two pieces I know of are the two tea warmers. So, at the moment, my feelings are that the patent applies to the shape (and not the "Inverted Prisms" pattern).