Insignia Technologies Limited

Weatherford/lamb, Inc.

University of Strathclyde

Graham Alexander Skinner

Erik Smyth

Deborah Allan

David Michael Haugen

Thomas Floyd Bailey

Kevin W Smith

David J Brunnert

Frederick Thomas Tilton

Ram Kumar Bansal

Andrew Mills

Pauline Grosshans

Tom Fuller

Roy W Rooyakkers

There is described an indicator device comprising: an indicator section comprising an indicator material that displays different visible properties in response to the presence or absence of an activating agent; an activator section comprising an activating agent that effects a change in the visible properties of the indicator material; and a barrier section comprising a barrier layer that is substantially impermeable to the activating agent, the barrier section being located between the indicator section and the activator section; wherein at least part of the barrier layer is configurable to allow the activating agent and the indicator material to come into contact with each other, thereby effecting a visible change. The device may be used to detect or report the passage of time and can be applied to perishable goods and/or associated packaging to show that packaging has been compromised and/or that the device has been compromised.

Indicator device

There is described an indicator device for indicating the passage of time, the indicator device comprising an indicator section and a barrier section adjacent thereto, said indicator section comprising: an indicator material; a substrate material; and a first adhesive layer; the indicator material and the substrate material being in the form of one or more layers; the indicator material displaying different visible properties in response to the presence or absence of a chemical agent and/or the concentration thereof; the barrier section comprising a removable barrier layer, the removable barrier layer being substantially impermeable to the chemical agent; wherein on removal of the removable barrier layer, the concentration of the chemical agent in the indicator section changes over time, effecting a visible change. The device may be used to detect the presence/absence of oxygen, water, carbon dioxide, an amine, ammonia, and/or carboxylic acids or to indicate the passage of time.

Time passage indicator

There is described an indicator device for detecting a change in atmospheric conditions, the indicator device comprising an indicator section and a barrier section adjacent thereto, said indicator section comprising: an indicator material; a substrate material; and a first adhesive layer; the indicator material and the substrate material being incorporated into one or more layers; wherein the indicator material displays different visible properties in different atmospheric conditions, and wherein the barrier section provides a semi-permeable seal configured to allow controlled flow to the indicator of an atmospheric agent that effects a change in visible properties of the indicator material. There is also described a method for preparing an indicator device, and products derived therefrom. The indicator device may be used to detect oxygen, water, carbon dioxide, an amine and/or ammonia, or to indicate the passage of time.

Embodiments of the present invention include methods and apparatus for dynamically controlling pressure within a wellbore while forming the wellbore. In one aspect, one or more pressure control apparatus are used to maintain desired pressure within the wellbore while drilling the wellbore. In another aspect, pressure is dynamically controlled while drilling using foam to maintain a substantially homogenous foam flow regime within the wellbore annulus for carrying cuttings from the wellbore.

Managed pressure drilling

A chemical indicator having a particulate inorganic substrate, and at least one reactive dye or ink coated on and/or impregnated within the particulate inorganic substrate. Coating and/or impregnating at least one reactive dye or ink on or within a particulate inorganic substrate improves the storage stability and/or thermal stability of the at least one reactive dye or ink, which typically includes relatively unstable compounds. This allows the present indicators to be incorporated into thermoplastic polymer materials and processed conventionally while maintaining the efficacy and stability of the new indicators. The indicators provide simple, reliable, and cost effective detection means for detecting analytes such as ammonia, carbon dioxide, and oxygen, and may find use in applications such as food packaging and medical applications.

Intelligent pigments and plastics

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Renfrew, United Kingdom

Graham Alexander Skinner