Patent US3679351A successfully refreshed from Google Patents.
US3679351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Attenuation of thermal radiation with phototropic dyes
Assignee: Wyeth Holdings LLC
•
Filing: 1961-12-07
•
Granted: 1972-07-25
•
Expires: 1981-12-07
Abstract
Abstract OBJECTS, PARTICULARLY CYANOETHYLATED CELLULOSE, CELLULOSE ACETATE OR NYLON TEXTILE MATERIALS, ARE PROTECTED FROM THE EFFECTS OF INCIDENT, HIGH INTENSITY FLASH RADIATION BY COLORING THEM WITH CERTAIN PHOTOTROPIC AZO DYES WHICH UPON EXPOSURE TO SAID RADIATION EXHIBIT A SUBSTANTIALLY INSTANTANEOUS CHANGE TO A WHITE OR COLORLESS CONDITION AND WHICH UPON CEASATION OF EXPOSURE TO SAID RADIATION REVERT RAPIDLY TO THEIR ORIGINAL COLOR.
Inventors
- 👤 Leonard Weissbein
- 👤 Samuel James O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:14
CPC Classifications
D; D06; D06P; D06P3/00; D06P1/00; D06P1/004; D06P1/16; Y; Y10; Y10S; Y10S8/00; Y10S8/21
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |