Charles B Stevens

US Patent:

20030128629, Jul 10, 2003

Filed:

Jan 4, 2002

Appl. No.:

10/036890

Inventors:

Charles Stevens - Sunnyvale CA, US

International Classification:

G04B019/22

US Classification:

368/023000

Abstract:

World Clock comprising: a hollow, translucent sphere with graphics on its surface representing the world's land masses, an opaque half sphere nested within the translucent sphere, an enclosure positioned directly below the sphere, the enclosure housing an electronic clock mechanism and associated LED display, a microprocessor and associated electronics, a gear reduced motor and a vertically oriented tube extending from the base of the enclosure through the top of said enclosure and terminating in a light bulb socket and associated light bulb located at the center of the sphere. The external surface of the sphere has a plurality of push button type switches located at major cities. When the user presses a switch, the clock display shows the current time in that city. The opaque hemisphere turns once every twenty four hours so that part of the world is in dark and part in light as defined by the time in a particular part of the world. A crescent shaped arm located outside the sphere can be swung by the user and the clock display will show the time along the longitudinal axis closest to the arm. In this way a person can know the current time in any part of the world and can realistically see the light and dark conditions of any part of the world

US Patent:

20110240861, Oct 6, 2011

Filed:

Mar 30, 2011

Appl. No.:

13/076162

Inventors:

Charles G. Stevens - Danville CA, US
Joseph W. Tringe - Walnut Creek CA, US
Christopher Thomas Cunningham - Livermore CA, US

Assignee:

LAWRENCE LIVERMORE NATIONAL SECURITY, LLC - Livermore CA

International Classification:

G01J 5/02

US Classification:

25033901, 250340

Abstract:

In one embodiment, a heterodyne detection system for detecting light includes a first input aperture adapted for receiving first light from a scene input, a second input aperture adapted for receiving second light from a local oscillator input, a broadband local oscillator adapted for providing the second light to the second input aperture, a dispersive element adapted for dispersing the first light and the second light, and a final condensing lens coupled to an infrared detector. The final condensing lens is adapted for concentrating incident light from a primary condensing lens onto the infrared detector, and the infrared detector is a square-law detector capable of sensing the frequency difference between the first light and the second light. More systems and methods for detecting light are described according to other embodiments.

US Patent:

20110242527, Oct 6, 2011

Filed:

Mar 30, 2011

Appl. No.:

13/076107

Inventors:

Charles G. Stevens - Danville CA, US
Joseph W. Tringe - Walnut Creek CA, US

Assignee:

LAWRENCE LIVERMORE NATIONAL SECURITY, LLC - Livermore CA

International Classification:

G01J 1/00

US Classification:

356213

Abstract:

In one embodiment, a heterodyne detection system for detecting light includes a first input aperture adapted for receiving a first light from a scene input, a second input aperture adapted for receiving a second light from a local oscillator input, a broadband local oscillator adapted for providing the second light to the second input aperture, a dispersive element adapted for dispersing the first light and the second light, and a final condensing lens coupled to an infrared detector. The final condensing lens is adapted for concentrating incident light from a primary condensing lens onto the detector, and the detector is a square-law detector capable of sensing the frequency difference between the first light and the second light. More systems and methods for detecting light are disclosed according to more embodiments.

US Patent:

60780487, Jun 20, 2000

Filed:

Apr 27, 1998

Appl. No.:

9/066662

Inventors:

Charles G. Stevens - Danville CA
Norman L. Thomas - Livermore CA

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

G01J 318
G02B 518

US Classification:

25033902

Abstract:

A small spectrograph containing no moving components and capable of providing high resolution spectra of the mid-infrared region from 2 microns to 4 microns in wavelength. The resolving power of the spectrograph exceeds 20,000 throughout this region and at an optical throughput of about 10. sup. -5 cm. sup. 2 sr. The spectrograph incorporates a silicon immersion echelle grating operating in high spectral order combined with a first order transmission grating in a cross-dispersing configuration to provide a two-dimensional (2-D) spectral format that is focused onto a two-dimensional infrared detector array. The spectrometer incorporates a common collimating and condensing lens assembly in a near aberration-free axially symmetric design. The spectrometer has wide use potential in addition to general research, such as monitoring atmospheric constituents for air quality, climate change, global warming, as well as monitoring exhaust fumes for smog sources or exhaust plumes for evidence of illicit drug manufacture.

US Patent:

41101820, Aug 29, 1978

Filed:

Jun 17, 1976

Appl. No.:

5/696997

Inventors:

Charles G. Stevens - Pleasanton CA

Assignee:

The United States of America as represented by the United States
Department of Energy - Washington DC

International Classification:

B01J 110

US Classification:

2041571R

Abstract:

A method of separating isotopes based on photoselective electron capture dissociation of molecules having an electron capture cross section dependence on the vibrational state of the molecule. A molecular isotope source material is irradiated to selectively excite those molecules containing a desired isotope to a predetermined vibrational state having associated therewith an electron capture energy region substantially non-overlapping with the electron capture energy ranges associated with the lowest vibration states of the molecules. The isotope source is also subjected to electrons having an energy corresponding to the non-overlapping electron capture region whereby the selectively excited molecules preferentially capture electrons and dissociate into negative ions and neutrals. The desired isotope may be in the negative ion product or in the neutral product depending upon the mechanism of dissociation of the particular isotope source used. The dissociation product enriched in the desired isotope is then separated from the reaction system by conventional means.

US Patent:

45049530, Mar 12, 1985

Filed:

Feb 1, 1983

Appl. No.:

6/462819

Inventors:

Charles G. Stevens - Danville CA

Assignee:

The United States of America as represented by the Department of Energy - Washington DC

International Classification:

H01S 300

US Classification:

372 56

Abstract:

A tunable source (11) of coherent infrared energy includes a heat pipe (12) having an intermediate region (24) at which cesium (22) is heated to vaporizing temperature and end regions (27, 28) at which the vapor is condensed and returned to the intermediate region (24) for reheating and recirculation. Optical pumping light (43) is directed along the axis of the heat pipe (12) through a first end window (17) to stimulate emission of coherent infrared energy which is transmitted out through an opposite end window (18). A porous walled tubulation (44) extends along the axis of the heat pipe (12) and defines a region (46) in which cesium vapor is further heated to a temperature sufficient to dissociate cesium dimers which would decrease efficiency by absorbing pump light (43). Efficient generation of any desired infrared wavelength is realized by varying the wavelength of the pump light (43).

US Patent:

20210256098, Aug 19, 2021

Filed:

May 5, 2021

Appl. No.:

17/302523

Inventors:

- San Francisco CA, US
Charles Stevens - Mountain View CA, US

International Classification:

G06F 21/10
H04N 21/262
H04N 21/266
H04N 21/8355
G06F 21/60
G06F 21/62
H04L 9/08
H04L 29/06

Abstract:

Systems and methods for managing provisioning of keys prior to a key rotation are provided. A license server generates a license that is associated with a renewal time. The renewal time is a time that is prior to a key rotation time, and triggers a receiver device to send a renewal request prior to the key rotation time. The renewal time may be a randomized time prior to the key rotation time that differs for different receiver devices. The license is transmitted to the receiver device. The license server then receives a renewal request from the receiver device that is triggered at the renewal time. The license server generates a next license that comprises a next key, whereby the next key is a decryption key for decrypting the encrypted signal after the key rotation time. The next license is transmitted to the receiver device prior to the key rotation time.

US Patent:

20200089844, Mar 19, 2020

Filed:

Aug 28, 2019

Appl. No.:

16/553926

Inventors:

- San Francisco CA, US
Charles Stevens - Mountain View CA, US

International Classification:

G06F 21/10
H04N 21/262
H04N 21/266
H04N 21/8355
G06F 21/60
G06F 21/62
H04L 9/08
H04L 29/06

Abstract:

Systems and methods for managing provisioning of keys prior to a key rotation are provided. A license server generates a license that is associated with a renewal time. The renewal time is a time that is prior to a key rotation time, and triggers a receiver device to send a renewal request prior to the key rotation time. The renewal time may be a randomized time prior to the key rotation time that differs for different receiver devices. The license is transmitted to the receiver device. The license server then receives a renewal request from the receiver device that is triggered at the renewal time. The license server generates a next license that comprises a next key, whereby the next key is a decryption key for decrypting the encrypted signal after the key rotation time. The next license is transmitted to the receiver device prior to the key rotation time.