David J Rohweller

US Patent:

8167247, May 1, 2012

Filed:

Apr 5, 2010

Appl. No.:

12/754293

Inventors:

Dean R. Daily - Torrance CA, US
David J. Rohweller - Ojai CA, US
Tiffany Glassman - Hawthorne CA, US

Assignee:

Northrop Grumman Systems Corporation - Los Angeles CA

International Classification:

B64G 1/22

US Classification:

2441726, 2441581, 359613, 359601

Abstract:

A space-based occulter is selectively movable between stowed and deployed configurations. A base hub has a longitudinally oriented center axis. A plurality of petals are provided, each petal extending radially outward from, and spaced radially apart from, the base hub when in the deployed configuration. Each petal has a hypergaussian edge made up of a plurality of hypergaussian edge panels. Each hypergaussian edge panel defines a portion of the hypergaussian edge of the petal. Each hypergaussian edge panel is made substantially of a material having a near zero coefficient of thermal expansion. A circular central portion is located radially between the base hub and the plurality of petals. A covering skin extends laterally between the hypergaussian edges of each petal and over the circular central portion. The covering skin defines a substantially planar surface oriented substantially perpendicular to the center axis when the occulter is in the deployed configuration.

US Patent:

48134961, Mar 21, 1989

Filed:

Jun 1, 1988

Appl. No.:

7/200890

Inventors:

David J. Rohweller - Ventura CA
Joseph W. Pallini - Tomball TX

Assignee:

Vetco Gray Inc. - Houston TX

International Classification:

E21B 7124
E21B 720

US Classification:

175 7

Abstract:

A drill ahead tool for drilling the initial portion of a subsea well allows an operator to drill ahead after running conductor pipe. The running tool locates in the wellhead housing secured to the upper end of the string of conductor pipe. The running tool has a mandrel that connects into the string of drill pipe. The mandrel locates in a sleeve. The sleeve locates in a body of the running tool. The body has dogs which engage a groove in the wellhead housing to secure the running tool to the wellhead housing while the conductor pipe is being run. The sleeve has a cam on its exterior for maintaining the dogs in the extended position. The drill pipe rotates the sleeve to advance the cam to allow the dogs to be retracted. The mandrel and sleeve have a J-slot and pin that allow the mandrel to be released from the sleeve to continue drilling ahead.

US Patent:

46038868, Aug 5, 1986

Filed:

Mar 26, 1984

Appl. No.:

6/592508

Inventors:

Joseph W. Pallini - Houston TX
David J. Rohweller - Ventura CA

Assignee:

Vetco Offshore, Inc. - Ventura CA

International Classification:

F16L 5500

US Classification:

285 24

Abstract:

A snap type pin and box connector. A plurality of box diameters 24, 28, 32 interact with a plurality of pin diameters 36, 40, 44, 48 and 50 to produce a minimum clearance at an intermediate location 28, 44. The box load shoulder 56 is chamfered 54, as is a portion K of the split lock ring 14 adjacent to the split.

US Patent:

53157958, May 31, 1994

Filed:

Apr 1, 1992

Appl. No.:

7/862009

Inventors:

Daniel S. H. Chae - Goleta CA
David J. Rohweller - Ojai CA
Mark W. Thomson - Ventura CA

Assignee:

Astro Aerospace Corporation - Carpinteria CA

International Classification:

B66C 2306

US Classification:

52113

Abstract:

A deployable and retractable, telescoping style mast assembly and method employs a plurality of tubular sections of differing diameters. The tubular sections are nested one-in-another and are slidable with respect to each other, in a telescoping manner, to provide a deployable/retractable telescoping mast assembly. Retractable pins are provided to retractably extend from a collar coupled to at least one of the tube sections. In their extended state, the retractable pins are adapted to extend through apertures provided in an adjacent tube section. The retractable pins are provided with a head at one end thereof. The head of each pin is adapted to be engaged by a guide coupled to a third tube section upon the third tube section being in a collapsed state. Upon engagement with the pin head, the guide operates to pull the pin into a retracted state so as to retract the pin out of the pin receiving aperture.

US Patent:

20190328162, Oct 31, 2019

Filed:

Apr 16, 2019

Appl. No.:

16/385208

Inventors:

David Rohweller - Ojai CA, US

International Classification:

A47G 9/08
A47G 9/02
A41D 1/02
A41D 31/02

Abstract:

A thermal insulating structure having insulation channels formed therein to receive insulation material, a movement channel extending along the insulation channels to disburse the insulation between the insulation channels and a storage channel to store insulation material not being used in the insulation channels. The movement channel, insulation channels and storage channel being integrally formed with each other while being partially obstructed from each other to maintain insulating material in the desired channels until moved to another one of the channels by a swiping or patting motion on the structure to provide a widely ranging temperature adjustable structure such as a sleeping bag, jacket, or comforter.

US Patent:

20160159500, Jun 9, 2016

Filed:

Dec 9, 2015

Appl. No.:

14/964258

Inventors:

GEOFFREY W. MARKS - SANTA BARBARA CA, US
DAVID J. ROHWELLER - OJAI CA, US
CHRISTIAN J. PEDERSEN - VENTURA CA, US

Assignee:

NORTHROP GRUMMAN SYSTEMS CORPORATION - FALLS CHURCH VA

International Classification:

B64G 1/44
H02S 30/20
B64G 1/22

Abstract:

A solar panel assembly for a spacecraft includes a bracket and first and second booms each having a first end secured to the bracket and a second end extending away from the bracket. Each boom is formed from a plurality of tubes that telescope between a stowed condition nested within one another and a deployed condition aligned end-to-end with one another. A solar panel is secured to the first and second booms for receiving solar energy and converting the solar energy to electrical power. The solar panel has a stowed condition collapsed between the first and second booms and a deployed condition extending in a plane between the first and second booms.

US Patent:

20140232611, Aug 21, 2014

Filed:

Aug 1, 2012

Appl. No.:

13/564393

Inventors:

Daniel J. Ochoa - Santa Barbara CA, US
Geoffrey W. Marks - Santa Barbara CA, US
David J. Rohweller - Ojai CA, US

Assignee:

Northrop Grumman Systems Corporation - Falls Church VA

International Classification:

H01Q 1/12
H01Q 1/36

US Classification:

343881

Abstract:

A helical antenna operable to be stowed on and deployed from a cubesat. The antenna includes two helical elements wound in opposite directions and defining an antenna column, where one of the helical elements is a conductive antenna element. The antenna also includes a plurality of circumferentially disposed vertical stiffeners extending along a length of the column and being coupled to the helical elements at each location where the vertical stiffeners and the helical elements cross. The helical elements and the vertical stiffeners are formed of a flexible material, such as a fiber glass, so that the antenna can be collapsed and stowed into a relatively small space. To position the antenna in the stowed configuration, the vertical stiffeners are folded on each other in a radial direction, and then the folded antenna is rolled in an axial direction from one end of the column to the other end.