Robert F Mast
Engineers in Auburn, WA

4579481, Apr 1, 1986

Apr 29, 1983

6/489757

Ben C. Gerwick - San Francisco CA
Robert F. Mast - Auburn WA

Standard Oil Company - OH

E02B 1700

405227

A mobile platform structure, installation and method for use in arctic waters where the dominant environmental loading threats are posed by winter ice pressures and summer ice floes. The structure includes an ice load bearing, submergible substructure and a platform superstructure of approximately equal lateral dimensions. The substructure has a height approximately equal its depth of submergence when ballasted down onto the sea floor and includes a plurality of peripherally arranged, surface accessible spud guides. The spuds are laterally restrained by the spud guides in the top and bottom walls for transmission of lateral loads therebetween at respective vertically spaced apart fulcrum points and are vertically movable in the spud guides for penetration into high shear soils which may be overlaid by relatively low shear soils whereby the shear capacities of both soils combine with the frictional capacity of the structure/sea floor interface to provide high displacement resistance to lateral ice loads. Provision also is made for extracting the spuds for redeployment of the structure at another arctic installation site and for fixedly but releasably securing the spuds in an elevated position within the spud guides when not in use.

H422, Jan 5, 1988

Apr 23, 1987

7/043272

Robert W. Julian - Oxnard CA
Robert F. Mast - Auburn WA
Joseph R. Schlechten - Puyiallup WA
George E. Warren - Oxnard CA
Manfred H. Zinserling - Renton WA

The United States of America as represented by the Secretary of the Navy - Washington DC

E02D 322

405212

A high-energy-absorbing prestressed concrete fender pile, and fendering sem using a plurality of such piles, constructed from high-strength concrete prestressed with longitudinal tensioned strands only partially prestressed such that the longitudinal strands remian elastic to provide high remaining material strength for absorbing high energy impact prior to reaching the yield strength of the strands; the longitudinal tensioned strands are wrapped with an outer spiral wire reinforcement, and the longitudinal strands are preferably stressed to remain elastic until the concrete reches a capacity of 0. 003 inch/inch compression strain.

4596495, Jun 24, 1986

Feb 22, 1985

6/704558

Robert A. Scharnell - Clayton CA
Robert F. Mast - Auburn WA

Standard Oil Company - OH

E02B 1702

405227

A spud bushing system for a mobile offshore arctic drilling structure that permits removal of a spud bushing in a controllable manner even under load. The spud bushing system is characterized by a bushing seat fixed in the structure, an annular bushing surrounding the spud and operative when seated in the bushing seat to support laterally the spud while permitting relative vertical movement therebetween, and plural hydraulic actuators arranged about the periphery of the bushing seat and operable to effect seating and controlled unseating of the bushing.

4576519, Mar 18, 1986

May 23, 1983

6/497389

Robert F. Mast - Auburn WA
William J. Cichanski - Tacoma WA
Francis R. Walker - Federal Way WA
Donald D. Magura - Vancouver, CA

Exxon Production Research Co. - Houston TX

E02B 1700

405207

An improved offshore platform base (12) is disclosed having three sets of substantially parallel bulkheads (24, 26, 28) which intersect one another at about 120. degree. forming a repeatable array of contiguous triangular (30) and hexagonal-shaped (34) chambers.