David E Berglund

US Patent:

6776801, Aug 17, 2004

Filed:

Dec 13, 2000

Appl. No.:

09/735762

Inventors:

David N. Berglund - Cambridge MA

Assignee:

Sail Star Inc. - Tortola

International Classification:

D06F 4300

US Classification:

8142, 8158

Abstract:

An apparatus and a method of operating a dry cleaning system are disclosed which utilize liquid carbon dioxide as the cleaning medium. The apparatus comprises two storage tanks in conjunction with a cleaning vessel, where one of the storage tanks is employed for pressure equalization and the other storage tank is employed for bulk solvent transfer to and from the cleaning vessel. The apparatus also comprises a return line from the cleaning vessel, which is routed back into the cleaning vessel where it forms a heat exchange coil. In the method of operating the dry cleaning system, the pressure equalization tank is used for absorbing temperature fluctuations and for providing efficient control of the transfer of the dry cleaning medium, using a compressor for subsequent bulk transfer.

US Patent:

62309218, May 15, 2001

Filed:

Apr 4, 2000

Appl. No.:

9/542164

Inventors:

David N. Berglund - Cambridge MA

Assignee:

Sail Star Limited - Causeway Bay

International Classification:

B65D 4532

US Classification:

220319

Abstract:

A closure system which provides a lubricated lock ring on a hinged door assembly rather than proximate a pressure vessel is provided. The configuration of this system removes lubricants from the region immediately adjacent a pressure vessel entrance to be sealed by the door assembly. A shorter entrance tunnel for access to the pressure vessel interior is also provided by this configuration. A clamp ring having radially extending lugs is rigidly affixed proximate to and partially defining the pressure vessel entrance. The door has a continuous thread about an outer circumferential surface thereof. A lock ring having a complementary interior continuous thread is in rotational communication with the threaded circumferential surface of the door. The lock ring also has plural, inwardly projecting lugs which are capable of passing between the clamp ring lugs when the door is swung toward the clamp ring. The lock ring is capable of being rotated by a rotary actuator for engagement of the clamp ring lugs with the lock ring lugs.