US2844442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing bright yellow colored sulfides
Assignee: Monsanto Chemicals Ltd
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Filing: 1957-05-20
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Granted: 1958-07-22
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Expires: 1977-05-20
Abstract
No abstract record available.
Inventors
- 👤 John W Lefforge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:25
CPC Classifications
C; C01; C01B; C01B25/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A METHOD OF PREPARING BRIGHT YELLOW COLORED PHOSPHORUS SULFIDES WHICH COMPRISES INTRODUCING BORIC OXIDE INTO A MASS OF DARKLY COLORED PHOSPHORUS SULFIDE, AND SUBJECTING THE RESULTING PRODUCT TO DISTILLATION TO SEPARATE SAID PHOSPHORUS SULFIDE IN THE FORM OF A PRODUCT HAVING A BRIGHT YELLOW COLOR, SAID BORIC OXIDE BEING EMPLOYED IN AN AMOUNT SUFFICIENT TO PRODUCE SAID COLOR IMPROVEMENT.
Claim 2
Independent Claim
59 words
A METHOD OF PREPARING BRIGHT YELLOW COLORED PHOSPHORUS SULFIDES WHICH COMPRISES INTRODUCING BORIC OXIDE INTO A MASS OF DARKLY COLORED PHOSPHORUS SULFIDE, AND SUBJECTING THE RESULTING PRODUCT TO DISTILLATION TO SEPARATE SAID PHOSPHORUS SULFIDE IN THE FORM OF A PRODUCT HAVING A BRIGHT YELLOW COLOR, SAID BORIC OXIDE BEING EMPLOYED IN AN AMOUNT SUFFICIENT TO PRODUCE SAID COLOR IMPROVEMENT.
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) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |