Marflow Engineering Ltd v Cassellie Ltd
Decision date: 26 February 2019
Neutral citation: [2019] EWHC 410 (IPEC)
Overall AI summary confidence: high
Short overview
This short overview is intended to summarise the case, issues and outcome so far as they are supported by the judgment.
AI confidence in this short overview: high
This case concerned UK Patent No. 2 368 888, which claims a method of installing a fluid-using appliance using a mounting plate with apertures and locking members. The court construed key features (notably what counts as the "fluid pipe" and that a "locking member provided in or on" the plate must be attached to or form part of the plate before and after locking), found the patent valid over Krone and Hubbard, and held that Cassellie's method of installation, when used, fell within claim 1 and infringed.
Ratio decidendi
This summary is intended to identify the ratio decidendi, meaning the legal reasons for deciding and the binding part of the decision.
AI confidence in this ratio decidendi summary: medium
The binding ratio that can be safely identified is that, for a claim requiring a locking member "provided in or on" a mounting member, that feature requires the locking member to be attached to or form part of the mounting member both before and after locking; a screw thread on the pipe itself is not a locking member "provided in or on" the plate. The court also treated credibility of expert evidence as decisive on inventive-step questions, finding the patent non-obvious on the more reliable evidence.
Obiter dicta
This summary is intended to identify obiter dicta, meaning observations made by the way that were not necessary to deciding the case and are not binding.
AI confidence in this obiter dicta summary: medium
The judgment observed (not as binding law) that the specification's discussion of a Continental Plate, though not part of UK common general knowledge, can nonetheless assist understanding of the claimed invention, and made a factual observation that UK plumbers tend to be conservative in practice, which can be relevant background when assessing obviousness.
Warning
- The chunk includes repeated passages of the judgment text; care required when extracting distinct passages. Notes contain repeated passages and may not include the full judgment; they should be treated as potentially incomplete.