US2824788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing bright yellow colored phosphorus sulfide
Assignee: MOUSANTO CHEMICAL Co
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Filing: 1954-07-23
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Granted: 1958-02-25
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Expires: 1974-07-23
Abstract
No abstract record available.
Inventors
- 👤 John W Lefforge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:36
CPC Classifications
C; C01; C01B; C01B25/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
THE METHOD OF PREPARING BRIGHT YELLOW COLORED PHOSPHORUS SULFIDES WHICH COMPRISES INTRODUCING FREE OXYGEN-CONTAINING GAS INTO A MASS OF DARKLY COLORED PHOSPHORUS SULFIDE WHILE SUBJECTING THE RESULTING PRODUCT TO DISTIALLATION TO SEPARATE SAID PHOSPHORUS SULFIDE IN THE FORM OF A PRODUCT HAVING A BRIGHT CANARY YELLOW COLOR, SAID FREE OXYGEN-CONTAINING GAS BEING EMPLOYED IN AN AMOUNT SUFFICIENT TO PRODUCE SAID COLOR IMPROVEMENT.
Claim 2
Independent Claim
62 words
THE METHOD OF PREPARING BRIGHT YELLOW COLORED PHOSPHORUS SULFIDES WHICH COMPRISES INTRODUCING FREE OXYGEN-CONTAINING GAS INTO A MASS OF DARKLY COLORED PHOSPHORUS SULFIDE WHILE SUBJECTING THE RESULTING PRODUCT TO DISTIALLATION TO SEPARATE SAID PHOSPHORUS SULFIDE IN THE FORM OF A PRODUCT HAVING A BRIGHT CANARY YELLOW COLOR, SAID FREE OXYGEN-CONTAINING GAS BEING EMPLOYED IN AN AMOUNT SUFFICIENT TO PRODUCE SAID COLOR IMPROVEMENT.
References Cited (Backward Citations)
FR420832A
Cited
US2569128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |