Writing instrument and indicator method
Abstract
Abstract A MARKING TOOL FOR DETECTING THE PRESENCE OF SUSPECTED CHEMICAL SUBSTANCES ON OR ADJACENT TO OR EVEN CONSTITUTING A SURFACE BY DISPENSING THEREFROM UPON THE SAID SURVACE A REAGENT, IN SOLID OR LIQUID FORM WHICH IS CAPABLE OF UNDERGOING COLORIMETRIC CHANGE UPON REACTION WITH THE CHEMICAL SUBSTANCES, THE REACTION BEING PERMITTED TO OCCUR IN A FILM ENVIRONMENT AT THE SITUS OF THE MARK. CRAYONS, PENCILS, NIBBED PENS, BALL POINT PENS AND OTHER STYLUS-LIKE CONTAINERS OR WRITING INSTRUMENTS ARE CONSIDERED WITHIN THE SCOPE OF THE INVENTION. THE REAGENTS MAY BE ANY DETECTING DYE OR OTHER CHEMICAL SUBSTANCE WHICH IS SUSCEPTIBLE OF A COLOR CHANGE DURING THE DESCRIBED REACTION, THEREBY INDICATING THE PRESENCE OF THE CHEMICAL SUBSTANCE.
Inventors
- 👤 Walter Florin
Bibliographic Details
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |