Expiration date system
OwnerAbraham Wieninventor
Life of this patent
Estimating the term…
Abstract
An expiration date system contains a time release mechanism for marking a predetermined interval of time in the range from six months to one year. The mechanism contains a vessel, in which there are brought together in any order a) water, b) a neutralizer, c) a source of oxygen, and d) a hydroquinone compound, such that the pH of the contents of the vessel is greater than 7.0 and the interval being marked begins when the last of items a), b), c) and d) is brought into the presence of the other items and the interval is a function of the pH and of the temperature.
Claims15
A system for indicating an end of a predetermined interval of time in a range from two days to two years, the system comprising:
- a vessel, said vessel having the following components added, in any order, said components being i) water, ii) a neutralizer, iii) a source of oxygen, and iv) a hydroquinone compound, wherein a combination of said components imparts a pH greater than 7.0;
- a start time for the predetermined interval of time begins when all of said components are combined in said vessel;
- and
- an end time for said predetermined interval of time is indicated by a visual indicator, said end time is a variable time period being an adjustable function of pH and temperature.
A method for measuring a time interval comprising:
- selecting a desired time interval;
- selecting a pH greater than 7.0;
- providing components of water, a neutralizer, a source of oxygen, and a hydroquinone compound to impart the pH selected when combined;
- providing a vessel, with a visual indicator, to combine the components;
- combining the components in the vessel, wherein the combination of the components correlates to a starting time point for measuring the time interval;
- and
- observing the visual indicator, wherein the visual indicator is a result of a reaction from the combining of the components and the visual indicator indicates an end point of the time interval.
Dependencies are inferred from the claim text.