Daniel T Wolf

US Patent:

40400123, Aug 2, 1977

Filed:

Apr 28, 1976

Appl. No.:

5/681118

Inventors:

Hewitt David Crane - Portola Valley CA
Daniel Errol Wolf - Menlo Park CA
Samuel Lindenberg - Pacific Palisades CA

Assignee:

Stanford Research Institute - Menlo Park CA

International Classification:

G06K 900

US Classification:

3401463SY

Abstract:

Identification of a specimen signature is provided by comparing the specimen with a previously recorded template signature. The comparison is performed by recording, for both specimen and template signatures, signals representing forces in three directions while generating these signatures. For handwritten signatures these forces are called pressure, for the force perpendicular to the plane of the paper, X for the left-right force in the plane of the paper, and Y for the near-far force in the plane of the paper. The recorded specimen signals are divided into equal parts, for example halves, and successive comparisons are made of the equal parts, first without any displacement, then with relative displacements, then by expanding the length of parts relative to one another, then by reducing the length of parts relative to one another, to find the highest correlation values for all of these comparisons. These are combined and compared with a reference.

US Patent:

41569113, May 29, 1979

Filed:

Nov 18, 1975

Appl. No.:

5/633032

Inventors:

Hewitt D. Crane - Portola Valley CA
Daniel E. Wolf - Menlo Park CA

Assignee:

Stanford Research Institute - Menlo Park CA

International Classification:

G06K 500
G06K 900

US Classification:

364419

Abstract:

In order to verify the authenticity of the signature of an individual, first a sample signature is written with a pen which can generate electrical signals representative of the forces exerted in the plane of the paper in the process of writing. These signals are sampled and then scaled so that the signature when displayed, can be fitted within a predetermined display area. The scaled signals generated from the sample signature are then stored. When it is desired to compare the sample signature with a signature which is subsequently written, called a specimen signature, the specimen signature is written and is processed for display in the same manner as was the sample signature. The scaled sample signature signals are then called out of storage and displayed, as are the scaled signals generated in the course of writing the specimen signature. Any deviations between the signatures are very readily detectable by observing the display.

US Patent:

63083698, Oct 30, 2001

Filed:

Feb 24, 2000

Appl. No.:

9/511775

Inventors:

Alejandro Garcia - Union City CA
Brent Krick - Mountain View CA
Anthony Nichtawitz - Lima, PE
Daniel Nordeen - Boulder Creek CA
Josh Oen - Fremont CA
Kenneth Smith - Cupertino CA
Vincent Suro - Sunnyvale CA
Daniel Wolf - San Jose CA

Assignee:

Silikinetic Technology, Inc. - Fremont CA

International Classification:

B08B 104

US Classification:

15230

Abstract:

A wafer cleaning apparatus provides two opposed brushes for brushing a vertically disposed wafer in a tank which can contain a process liquid. A pressure controller adaptively controls the pressure exerted by the brushes on the wafer to compensate for brush wear. Rim driving wheels engage the wafer periphery with a porous jacket coupled to a fluid delivery system, thereby simultaneously rotating and cleaning the periphery of the wafer. The apparatus includes a fluid delivery system for separately and independently delivering a plurality of constituents of a cleaning solution to the brushes, thereby ensuring that a freshly mixed cleaning solution reaches the wafer. The tank can be filled with a process liquid through which megasonic waves provided by a transducer can propagate and impinge upon the wafer thereby enhancing the cleaning of the wafer or the brushes.

US Patent:

40865673, Apr 25, 1978

Filed:

Aug 20, 1976

Appl. No.:

5/716344

Inventors:

Hewitt David Crane - Portola Valley CA
Daniel Errol Wolf - Menlo Park CA

Assignee:

Stanford Research Institute - Menlo Park CA

International Classification:

G06K 900

US Classification:

3401463SY

Abstract:

When signals derived from a template signature are to be compared directly with signals derived from a specimen signature, because no two signatures are alike, there is a requirement for providing a certain degree of "rubberiness" between the specimen and template signals. Previously such rubberiness was achieved by breaking the signal up into fixed portions and then conducting translation, stretch and contraction between these fixed portions in the course of the comparison. In this invention, advantage is taken of the existence of prominent landmarks in the template and specimen signatures, and the signatures are broken up between these landmarks for the purpose of achieving rubberiness and/or translation. The landmarks in the signals derived from the signatures to be compared are exactly aligned before the correlation process is undertaken.

US Patent:

40400107, Aug 2, 1977

Filed:

Nov 6, 1975

Appl. No.:

5/629290

Inventors:

Hewitt D. Crane - Portola Valley CA
Daniel E. Wolf - Menlo Park CA
John S. Ostrem - Menlo Park CA

Assignee:

Stanford Research Institute - Menlo Park CA

International Classification:

G06K 900

US Classification:

3401463SY

Abstract:

A person, who is to have his identity verified, first writes his signature or any other appropriate group of characters or symbols several times with a special pen which produces signals representative of the writing forces in the plane of the paper and the writing pressure. From these a number of different parameters are derived. These parameters may be, for example, average value, energy, timing, number of zero crossings, etc. Average values and standard deviations are obtained for each of these parameters and these are stored as components of a template vector. In order to detect whether or not a later handwriting sample is authentic, a measure of the difference between the template vector and the later handwriting sample vector is calculated. The distinction between true signatures and forgeries is then made on the basis of this difference. If it is less than an appropriately selected value the signature is judged authentic while if it is above such value it is judged a forgery.

US Patent:

60702842, Jun 6, 2000

Filed:

Jul 10, 1998

Appl. No.:

9/113703

Inventors:

Alejandro Garcia - Union City CA
Brent Krick - Mountain View CA
Anthony Nichtawitz - Lima, PE
Daniel Nordeen - Boulder Creek CA
Josh Oen - Fremont CA
Kenneth Smith - Cupertino CA
Vincent Suro - Sunnyvale CA
Daniel Wolf - San Jose CA

Assignee:

Silikinetic Technology, Inc. - Fremont CA

International Classification:

A47L 102

US Classification:

15102

Abstract:

A wafer cleaning apparatus provides two opposed brushes for brushing a vertically disposed wafer in a tank which can contain a process liquid. A pressure controller adaptively controls the pressure exerted by the brushes on the wafer to compensate for brush wear. Rim driving wheels engage the wafer periphery with a porous jacket coupled to a fluid delivery system, thereby simultaneously rotating and cleaning the periphery of the wafer. The apparatus includes a fluid delivery system for separately and independently delivering a plurality of constituents of a cleaning solution to the brushes, thereby ensuring that a freshly mixed cleaning solution reaches the wafer. The tank can be filled with a process liquid through which megasonic waves provided by a transducer can propagate and impinge upon the wafer thereby enhancing the cleaning of the wafer or the brushes.

US Patent:

41908201, Feb 26, 1980

Filed:

Apr 21, 1978

Appl. No.:

5/898997

Inventors:

Hewitt D. Crane - Portola Valley CA
Daniel E. Wolf - Menlo Park CA

Assignee:

Stanford Research Institute International - Menlo Park CA

International Classification:

G06K 900

US Classification:

3401463SG

Abstract:

When trains of signals, derived from a written template signature, are to be compared directly with trains of signals, derived from a written specimen signature, because no two written signatures are identical, there is a requirement for providing a certain degree of "rubberiness" between the specimen and template signals. Previously, such rubberiness was achieved by breaking up the trains of signals into fixed portions and then conducting translation, stretch and contraction between these fixed portions in the course of the comparison. In this invention, advantage is taken of the existence of prominent landmarks in the trains of signals of the template and specimen signatures. The trains of signals are broken into segments by these landmarks. Segments of the specimen are stretched or contracted and translated to match corresponding segments of the template, to greatly simplify and enhance correlation process.

US Patent:

43441351, Aug 10, 1982

Filed:

Sep 7, 1978

Appl. No.:

5/940434

Inventors:

Hewitt D. Crane - Portola Valley CA
Daniel E. Wolf - Menlo Park CA

Assignee:

Stanford Research Institute - Menlo Park CA

International Classification:

G06K 500
G06K 900

US Classification:

364419

Abstract:

In order to verify the authenticity of the signature of an individual, first a sample signature is written with a pen which can generate electrical signals representative of the forces exerted in the plane of the paper in the process of writing. These signals are sampled and then scaled so that the signature when displayed, can be fitted within a predetermined display area. The scaled signals generated from the sample signature are then stored. When it is desired to compare the sample signature with a signature which is subsequently written, called a specimen signature, the specimen signature is written and is processed for display in the same manner as was the sample signature. The scaled sample signature signals are then called out of storage and displayed, as are the scaled signals generated in the course of writing the specimen signature. Any deviations between the signatures are very readily detectable by observing the display.