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Timm Piper´s
microcopy site
Principles of VBDC
Principles of VPDC
Principles of VPBC
Materials and Methods
Results of VBDC
Results of VPDC
Results of VPBC
Further developments
Further developments
Further devepolments
Optical calculations
Summarizing remarks
and conclusions
Video Downloads
List of Personal 
About me
Contact Details

I have applied for my work to be protected by patent. Thus, the three methods invented by me have been submitted to the German Patent and Trade Mark Office (“Deutsches Patent- und Markenamt”, DPMA); they are registered as follows:

10 2011 002 030.6 (Variable Bright-Darkfield-Contrast, VBDC),
10 2011 054 106.3 (Variable Phase-Darkfield-Contrast, VPDC),
10 2012 005 911.6 (Variable Phase-Brightfield-Contrast, VPBC).

The original version of these patent specifications (PDF file containing the complete documentation of all patents, circa 8.5 MB including text and images / construction plans) can be downloaded from the following download servers (direct links for download):

Download-link 1:

Download-link 2:

Annotations and advice for download:

Download-link 1:
This download service can be used without any registration or log-in procedure. Please note that the website from contains a lot of advertisement and false links entitled “Download” or “Play” leading to aberrant websites. Only the small download link signed by a green arrow and situated in the center of the screen leads to my PDF file so that you can save it on your computer or directly open it by use of a PDF reader.

Download-link 2:
As far as I can see, this download service is free from advertisement. When the website has been started, you can change the language setting on demand. Then, please click the blue button “Herunterladen” or “Download now”.
Then, please login as follows:
“Einloggen” or “Login”: E-mail:,
Password: patent.

Now, you have to wait for 20 seconds until the download link appears, and last, please click the button “Datei jetzt herunterladen” or “Download file now” so that you can save the PDF on your computer.

Last Update: August 10th, 2012
Copyright: Timm Piper, 2012