Stephen W Tsai

US Patent:

6868753, Mar 22, 2005

Filed:

Jun 27, 2001

Appl. No.:

09/894856

Inventors:

Stephen W. Tsai - Palo Alto CA, US

Assignee:

The Board of Trustees of the Leland Stanford Junior Univesity - Stanford CA

International Classification:

F16F015/10

US Classification:

74572

Abstract:

A flywheel for use as an energy storage device is made of hoops of different fiber composite layers, the radial thickness of each hoop and the physical properties of the fiber composite in each loop being chosen by a computer modeling optimization procedure to maximize total energy of storage while minimizing radial stress.

US Patent:

20060093802, May 4, 2006

Filed:

Sep 23, 2005

Appl. No.:

11/233716

Inventors:

Stephen Tsai - Palo Alto CA, US
Kazumasa Kawabe - Fukui Prefecture, JP

International Classification:

B32B 7/02

US Classification:

428216000

Abstract:

Fiber composite materials using thin plies with a thickness of less than 0.08 mm provide improved delamination resistance and thinner minimum gauge for laminates. Thin plies may be hybridized with conventional plies, interlaced for strength, and used with adhesives as reinforcement in bonding.

US Patent:

62317105, May 15, 2001

Filed:

Jun 4, 1999

Appl. No.:

9/326058

Inventors:

Eric Herup - Albuquerque NM
Steven Huybrechts - Sandia Park NM
Steven Griffin - Albuquerque NM
Stephen Tsai - Palo Alto CA

Assignee:

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

International Classification:

B65H 8100

US Classification:

156173

Abstract:

An innovative new structure, called ChamberCore, is disclosed that is damage tolerant, easy to manufacture, and has an inherent design feature that can be exploited to drastically reduce acoustic transmission through the structure. The structure is composed of previously cured tubes that are sectioned to form chambers and co-cured with facesheets to form a sandwich-type structure. Damage tolerance is derived from the fact that the structure has no weak facesheet-core interface as found in traditional sandwich-type structures. Additionally, each chamber has a hole to it through the inner facesheet effectively converting it into a Helmholtz resonator. These resonators can be tuned to attenuate broadband or specific acoustic transmission through the structure.

US Patent:

58886087, Mar 30, 1999

Filed:

Aug 14, 1996

Appl. No.:

8/700653

Inventors:

Stephen W. Tsai - Palo Alto CA

Assignee:

The Board of Trustees of the Leland Stanford Junior University - Stanford CA

International Classification:

B32B 512
B32B 712
B32B 312

US Classification:

428105

Abstract:

Composite grid/frame structures are constructed from grid elements 36 arranged in a grid pattern and bonded together by a vacuum infiltration technique or, alternatively, a filament winding technique. Grid elements 36 are sliced cross-sections of pultruded or filament-wound tubing typically made from glass or graphite fiber and epoxy resin. Common cross-sectional shapes are square, rectangular, triangular, and circular. Finished two-dimensional grids 46 may be combined with longitudinal rods 48 to form three-dimensional frames for concrete reinforcement, engine containment, and many other applications.

US Patent:

20220242087, Aug 4, 2022

Filed:

Jun 11, 2020

Appl. No.:

17/618680

Inventors:

- Stanford CA, US
Stephen W. TSAI - Honolulu HI, US

International Classification:

B32B 5/12
B32B 5/02
B32B 3/26

Abstract:

Described are composite grid structures that have a plurality of ply layers, each one of the plurality of ply layers comprising a plurality of first elongate tapes oriented in a first direction and a plurality of second elongate tapes oriented in a second direction, the second direction being offset from the first direction by an angle of at least 25 degrees. In the grid structures: each of the first elongate tapes has a first length extending between opposing ends of each of the plurality of first elongate tapes and a first midpoint intermediate the opposing ends, and each of the second elongate tapes has a second length extending between opposing ends of each of the plurality of second elongate tapes and a second midpoint intermediate the opposing ends. Associated composite laminate structures, grid structures, and methods of manufacturing and/or using the same are also disclosed.

US Patent:

20230075583, Mar 9, 2023

Filed:

Mar 18, 2021

Appl. No.:

17/798513

Inventors:

- Stanford CA, US
Stephen W. TSAI - Honolulu HI, US

International Classification:

B32B 27/08
B32B 3/10

Abstract:

Described are various dual-tapered composite laminate structures. These structures may comprise a plurality of finite sub-laminate cards, each one of the plurality of cards having the same shape and size as the other ones of the plurality of cards and having opposing surfaces oriented in a card plane, opposing primary edges of the planar surfaces, and opposing secondary edges of the planar surfaces, the opposing secondary edges being perpendicular to the opposing primary edges. The finite sub-laminate cards are tacked relative to one another in a successively offset manner. Also described are methods of stacking and sliding (for offset) the finite sub-laminate cards. Tapered fuselage skin and fuel tank covers are also considered.

US Patent:

20140335300, Nov 13, 2014

Filed:

Jul 21, 2014

Appl. No.:

14/336466

Inventors:

- Palo Alto CA, US
Stephen W. Tsai - Palo Alto CA, US

International Classification:

B32B 3/16
B32B 5/12
B32B 5/26

US Classification:

428 58

Abstract:

A fiber composite tape has a first two-layer strip having a first top layer with fibers angled at φ and a first bottom layer with fibers angled at 0, a second two-layer strip having a second top (or bottom) layer with fibers angled at −φ and a second bottom (or top) layer with fibers angled at 0, and a paper backing tape affixed to the two two-layer strips and joins them side-by-side at their edges to form a seam.