Protection of pipes or objects of similar shape against external or internal

Official title: Protection of pipes or objects of similar shape against external or internal damage or wear ({protection under water F16L1/123;} supporting of pipes inside other pipes or sleeves F16L7/00; used in connection with end fittings of hoses F16L35/00; protection of pipes or pipe fittings against corrosion or incrustation F16L58/00; protection thereof during transport B65D59/00)

F16L57/00 (Protection of pipes or objects of similar shape against external or internal) appears on 1,356 US grants and 1,340 published applications in this corpus.