while being maintained

Also, the proportions given may be modified, for example, .+-.10% and .+-.25%, while still being maintained within the ranges given in the specification.
US Pat. 4487757 - Colgate-Palmolive Company

The mixture was agitated while being maintained at about 120.degree. C. for 2 hours to drive off the solvent and then allowed to cool to room temperature to yield the coated carrier particles.
US Pat. 5061593 - Eastman Kodak Company

In a preferred embodiment, it has been shown that it may be advantageous to have the coupling cover protrude slightly above the plane formed by the air plenum walls 104, 106 such that the surface profile of the air plenum/coupling cover arrangement is concave, protruding slightly toward the region of contact with the photoreceptor belt 10, while being maintained in contact with the tip 99 of horn 92.
US Pat. 5512989 - Xerox Corporation

The refrigerant then enters a condenser, wherein heat is liberated to its environment causing the refrigerant to transform into its saturated liquid state while being maintained at a substantially constant pressure.
Thereafter, the refrigerant enters the evaporator and absorbs heat from its environment, causing the refrigerant to transform into its vapor state while being maintained at a substantially constant pressure.
US Pat. 6321547 - Kidwell Environmental Ltd., Inc.