US2636811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for stabilizing red phosphorus
Assignee: Individual
•
Filing: 1945-03-13
•
Granted: 1953-04-28
•
Expires: 1965-03-13
Abstract
No abstract record available.
Inventors
- 👤 George F Nordblom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:35
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/04; C01B25/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
PROCESS FOR PREPARING RED PHOSPHORUS OF INCREASED RESISTANCE TO OXIDATION FROM RED PHOSPHORUS CONTAINING COPPER IMPURITIES, SAID PROCESS COMPRISING INTIMATELY CONTACTING THE SAID IMPURE RED PHOSPHORUS WITH AN AQUEOUS SOLUTION OF ALKALI METAL CYANIDE FOR REMOVING COPPER FROM THE SAID RED PHOSPHORUS, THEREAFTER WASHING THE RED PHOSPHORUS TO REMOVE THE CYANIDE SOLUTION AND METAL CYANIDE COMPLEXES THEREFROM, AND THEREAFTER DRYING THE THUS PURIFIED AND MORE STABLE RED PHOSPHORUS.
Claim 2
Dependent Claim
68 words
PROCESS FOR PREPARING RED PHOSPHORUS OF INCREASED RESISTANCE TO OXIDATION FROM RED PHOSPHORUS CONTAINING COPPER IMPURITIES, SAID PROCESS COMPRISING INTIMATELY CONTACTING THE SAID IMPURE RED PHOSPHORUS WITH AN AQUEOUS SOLUTION OF ALKALI METAL CYANIDE FOR REMOVING COPPER FROM THE SAID RED PHOSPHORUS, THEREAFTER WASHING THE RED PHOSPHORUS TO REMOVE THE CYANIDE SOLUTION AND METAL CYANIDE COMPLEXES THEREFROM, AND THEREAFTER DRYING THE THUS PURIFIED AND MORE STABLE RED PHOSPHORUS.
References Cited (Backward Citations)
US1178081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |