Re. 28,332 



METHOD AND APPARATUS FOR PREVENTING 

 ICE DAMAGE TO MARINE STRUCTURES 



Joseph F. Schirtzinger, Pasadena, Calif., assignor to 

 Sea-Log Corporation, Pasadena, Calif. 



Original No. 3,669,052, dated June 13, 1972, Ser. No. 

 46,273, June 15, 1970. Application for reissue Oct. 

 25, 1973, Ser. No. 409,747 



InL CI. B63b 35/08 

 U.S. a. 114 — .5 R 15 Claims 



A marine well drilling platform or the like having legs 

 extending to the sea floor is protected from ice floes by 

 comminuting devices at the water line for breaking the ice 

 anl thereby preventing crushing or overturning of the 

 platform. The comminuting devices employ high velocity 

 impacts against the ice to cause its fracture into chips as 

 distinguished from cutting action. Rapidly rotating or re- 

 ciprocating mechanisms with large "teeth" for making im- 

 pact engagement with the ice are employed in separate 

 embodiments. Comminuting devices mounted for sweep- 

 ing adjacent a mooring buoy in one embodiment open a 

 path through an ice floe for protecting the buoy and a ship 

 moored at the buoy. 



Reissued Feb. 11, 1975 

 Keywords 



U.S. CI. 

 299-24 



; Ice protection; Offshore mooring 

 structure; Offshore platform, 

 fixed; Offshore platform, leg; 

 Offshore structure fender 



X.R. 9-3R; 61-1; 61-46; 114-42; 



Re. 28,966 



SYSTEM AND BARRIER FOR CONTAINING AN OIL 



SPILL 



Thomas Nicholas Blockwick, McLean, Va., assignor to Ocean 



Systems, Inc., Rsston, Va. 

 Original No. 3,708,982, dated Jan. 9, 1973. Ser. No. 79,997, 

 Oct. 21. 1970. Application for reissue Jan. 24, 1974, Ser. 

 No. 436,146 



Inl. CL E02b 15/0-1 

 U.S. Ci. 61—1 F 19 Claims 



A system for containing an oil spill comprising a plu- 

 rality of barrier modules each composed of a compos- 

 ite structure having a buoyant upper section .and a 

 water absorbing lower section which represents con- 

 currently the sole ballast for said upper section and 

 the subsurface barrier for the module. 



Reissued Sept. 21, 1976 



Keywords: Pollutant, surface barrier 



U.S. CI. X.R. 61-5; 11A-.5F; 210-83 



Figure from entry for original patent 



Figure 8. Additional examples of annotations for reissued patents. 



35 



