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• Efkolidis N., Kyratsis P. “Eco toy for the growth of ecological awareness”, The Greek Papent Office (ΟΒΙ), Certificate No: 6003108, 2010.

• Michail E., Pitsouni St., Kyratsis P., Efkolidis N., “A packaging series for Greek coffee”, The Greek Papent Office (ΟΒΙ), Certificate No: 6003117, 2010.

• Mexi E., Kyratsis P., Efkolidis N., “Milk packaging”, The Greek Papent Office (ΟΒΙ), Certificate No: 6003320, 2011.

• Alexopoulos V., Kyratsis P., Efkolidis N. “Feta cheese packaging”, The Greek Papent Office (ΟΒΙ), Certificate No: 6003319, 2011.

• Efkolidis N., Theoharidis S., Kyratsis P., “Design of wine vault made of used pallet”, The Greek Papent Office (ΟΒΙ), Certificate No: 6003386, 2012.

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• Despinidis A., Efkolidis N., Kyratsis P. "Packaging for energy drink and isotonic drink", The Greek Papent Office (ΟΒΙ), 2012.