US3667916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sterilization indicator
Assignee: Johnson and Johnson
•
Filing: 1970-11-17
•
Granted: 1972-06-06
•
Expires: 1990-11-17
Abstract
Abstract LOW-COST TELLTALE COMPOSITION, WHICH CHANGES FROM A SUBSTANTIALLY LIGHT COLOR TO A SUBSTANTIALLY DARK COLOR UNDER EITHER STEAM OR ETHYLENE OXIDE STERILIZATION CONDITIONS BUT IS OTHERWISE SUBSTANTIALLY INSENSITIVE TO NORMAL AMBIENT ENVIRONMENTAL CONDITIONS INCLUDING DAYLIGHT COMPRISES A SOLUTION OR DRIED SOLUTION OF SILVER NITRATE AND A BUFFERING QUANTITY OF A NITRATE PRESERVATIVE SELECTED FROM THE GROUP CONSISTING OF NITRIC ACID, SODIUM NITRATE O POTASSIUM NITRATE. THE TELLTALE COMPOSITION IN AQUEOUS ALCOHOLIC SOLUTION IS PRINTABLE ON ANY SUBSTRATE WITHOUT IMPARTING SUBSTANTIAL COLOR THERETO, BUT IS SELECTIVELY COLORABLE BY THE ADDITION OF DESIRED PIGMENTS OR DYES.
Inventors
- 👤 Martin E Sliva
- 👤 Roderic P Kwok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:15
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/12; G01N; G01N33/00; G01N33/44; G01N33/442; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/200833
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |