US3218261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a near infrared absorbing composition
Assignee: EIDP Inc
•
Filing: 1962-03-06
•
Granted: 1965-11-16
•
Expires: 1982-03-06
Abstract
No abstract record available.
Inventors
- 👤 Gall Walter George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:10
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/223; C; C03; C03C; C03C17/00; C03C17/06; C03C17/28; C03C17/32; C03C17/34; C03C2217/00; C03C2217/20; C03C2217/25; C03C2217/251; C03C2218/00; C03C2218/10; C03C2218/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A METHOD OF MAKING A NEAR INFRARED ABSORBING COMPOSITION WHICH COMPRISES THE STEPS OF MIXING AN AQUEOUS SOLUTION OF AN ALKALI METAL FERRICYANIDE WITH AN AQUEOUS SOLUTION OF A FERRIC SALT, SAID SOLUTIONS BEING ABOUT FROM 0.5 TO 1.0 MOLAR, AND THE MOLE RATIO OF FERRIC SALT/FERRIC BEING FROM 0.8 TO 1.2, HEATING THE THUS FORMED SOLUTION AT FROM ABOUT 90*C. TO THE REFLUX TEMPERATURE, FOR FROM WHEN A PRECIPITATE IS FORMED UP TO ABOUT 17 HOURS, SEPARATING THE THUS FORMED PRECIPITATE FROM THE AQUEOUS PHASE BY FILTRATION, AND DRYING SAID PRECIPITATE TO OBTAIN THE NEAR INFRARED ABSORBING COMPOSITION.
Claim 2
Independent Claim
99 words
A METHOD OF MAKING A NEAR INFRARED ABSORBING COMPOSITION WHICH COMPRISES THE STEPS OF MIXING AN AQUEOUS SOLUTION OF AN ALKALI METAL FERRICYANIDE WITH AN AQUEOUS SOLUTION OF A FERRIC SALT, SAID SOLUTIONS BEING ABOUT FROM 0.5 TO 1.0 MOLAR, AND THE MOLE RATIO OF FERRIC SALT/FERRIC BEING FROM 0.8 TO 1.2, HEATING THE THUS FORMED SOLUTION AT FROM ABOUT 90*C. TO THE REFLUX TEMPERATURE, FOR FROM WHEN A PRECIPITATE IS FORMED UP TO ABOUT 17 HOURS, SEPARATING THE THUS FORMED PRECIPITATE FROM THE AQUEOUS PHASE BY FILTRATION, AND DRYING SAID PRECIPITATE TO OBTAIN THE NEAR INFRARED ABSORBING COMPOSITION.
References Cited (Backward Citations)
US1504465A
Cited
US2020861A
Cited
US2232806A
Cited
US2479501A
Cited
US2636420A
Cited
US2697037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |