Microsoft's VC-1 is an example of something that was developed internally and released to a standards body, then was later encumbered by patents pooled by others.
Adoption of Ogg Vorbis was significantly hindered by vague threats of patent encumbrance from patent pools established around international standards.
WebM was threatened by MPEG-LA with an anti-VP8 patent pool.
Likewise Rambus very nearly succeeded in fooling a standards body into issuing a standard based on submarine patents (and did fool Intel into betting a generation of chipsets on it). FRAND is a good idea (well, an acceptable one anyway) that has never worked in practice. All systems can be gamed.
Please list an example.