US2664343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for stabilizing red phosphorus against oxidation
Assignee: Individual
•
Filing: 1944-01-27
•
Granted: 1953-12-29
•
Expires: 1964-01-27
Abstract
No abstract record available.
Inventors
- 👤 Martin S Silverstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:04
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/04; C01B25/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
PROCESS FOR TREATING RED PHOSPHORUS OF COMMERCE CONTAINING UP TO 700 PARTS OF IRON PER MILLION PARTS OF RED PHOSPHORUS-CONTAINING COMPOSITHEREFROM A RED PHOSHORUS-CONTAINING COMPOSITION OF INCREASED RESISTANCE TO OXIDATION, WHICH COMPRISES EXPOSING SAID RED PHOSPHORUS OF COMMERCE FOR A PERIOD OF 2 TO 20 DAYS TO A GASEOUS ATMOSPHERE CONTAINING OXYGEN AT A TEMPERATURE OF 40*C. TO 90*C. AND A RELATIVE HUMIDITY OF 50 TO 100% THEREBY TO FORM AN ACID COMPOSITION, THEREAFTER REMOVING ACID FROM THE RESULTING PHOSPHORUS-CONTAINING COMPOSITION AND RETAINING THE REMAINDER AS THE RED PHOSPHORUS PRODUCT WHICH IS MORE RESISTANT TO OXIDATION THAN THE RED PHOSPHORUS OF COMMERCE EMPLOYED AS THE STARTING MATERIAL.
Claim 2
Dependent Claim
107 words
PROCESS FOR TREATING RED PHOSPHORUS OF COMMERCE CONTAINING UP TO 700 PARTS OF IRON PER MILLION PARTS OF RED PHOSPHORUS-CONTAINING COMPOSITHEREFROM A RED PHOSHORUS-CONTAINING COMPOSITION OF INCREASED RESISTANCE TO OXIDATION, WHICH COMPRISES EXPOSING SAID RED PHOSPHORUS OF COMMERCE FOR A PERIOD OF 2 TO 20 DAYS TO A GASEOUS ATMOSPHERE CONTAINING OXYGEN AT A TEMPERATURE OF 40*C. TO 90*C. AND A RELATIVE HUMIDITY OF 50 TO 100% THEREBY TO FORM AN ACID COMPOSITION, THEREAFTER REMOVING ACID FROM THE RESULTING PHOSPHORUS-CONTAINING COMPOSITION AND RETAINING THE REMAINDER AS THE RED PHOSPHORUS PRODUCT WHICH IS MORE RESISTANT TO OXIDATION THAN THE RED PHOSPHORUS OF COMMERCE EMPLOYED AS THE STARTING MATERIAL.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |