Frank Keith Perkins

US Patent:

6482639, Nov 19, 2002

Filed:

Jun 22, 2001

Appl. No.:

09/886051

Inventors:

Eric S. Snow - Springfield VA
Martin Peckerar - Silver Spring MD
Leonard M. Tender - Bethesda MD
Stephanie J. Fertig - Springfield VA
Frank K. Perkins - Alexandria VA

Assignee:

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

International Classification:

C12M 134

US Classification:

4352872, 435 6, 435 71, 435 911, 435 912, 536 221, 536 231, 536 243, 536 2431, 536 2432, 438 49

Abstract:

Molecular recognition-based electronic sensor, which is gateless, depletion mode field effect transistor consisting of source and drain diffusions, a depletion-mode implant, and insulating layer chemically modified by immobilized molecular receptors that enables miniaturized label-free molecular detection amenable to high-density array formats. The conductivity of the active channel modulates current flow through the active channel when a voltage is applied between the source and drain diffusions. The conductivity of the active channel is determined by the potential of the sample solution in which the device is immersed and the device-solution interfacial capacitance. The conductivity of the active channel modulates current flow through the active channel when a voltage is applied between the source and drain diffusions. The interfacial capacitance is determined by the extent of occupancy of the immobilized receptor molecules by target molecules. Target molecules can be either charged or uncharged.

US Patent:

7142145, Nov 28, 2006

Filed:

Nov 23, 2004

Appl. No.:

10/997092

Inventors:

Keir C. Lauritzen - Odenton MD, US
Martin Peckerar - Sliver Spring MD, US
Frank K. Perkins - Alexandria VA, US

Assignee:

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

International Classification:

H03M 1/12

US Classification:

341155

Abstract:

An analog to digital converter circuit includes an isolation circuit, an input circuit including a resistor chain, a plurality of fixed threshold comparators, and an encoder. The resistor chain includes a plurality of resistors connected in series, the isolation circuit being configured to isolate a device supplying the analog input signal from the input circuit. The isolation circuit is connected to the input circuit at a top node of the resistor chain, and wherein 2values of the analog input voltage are connected to inputs of the fixed threshold comparators to produce corresponding output signals. Methods of converting an analog signal to a digital signal are also described.

US Patent:

20050079871, Apr 14, 2005

Filed:

Oct 13, 2004

Appl. No.:

10/964343

Inventors:

David Kirk - McKinney TX, US
Frank Perkins - Arlington TX, US
Terry Hinkle - Plano TX, US

Assignee:

RF Monolithics, Inc. - Dallas TX

International Classification:

G06F007/00
G06F017/30
G06F017/60
H04L012/28
H04L012/56
H04Q007/20

US Classification:

455446000, 705002000, 707001000

Abstract:

A system includes a database, a controller, and multiple nodes. The database is capable of storing information. The controller is capable of facilitating access to the database. The controller is also capable of detecting a new node in the network and, if necessary, communicating a network protocol to the new node to allow the new node to participate in the network. The information in the database could represent medical-related information. The nodes could include fixed nodes and portable nodes. The network could represent a mesh network.