US2526777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of hydrogen fluoride and/or silicon tetrafluoride from a hydrogen chloride containing gas
Assignee: Honeywell International Inc
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Filing: 1949-01-28
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Granted: 1950-10-24
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Expires: 1969-01-28
Abstract
No abstract record available.
Inventors
- 👤 Lee B Smith
- 👤 John D Calfee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:20
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
THE PROCESS FOR REDUCING THE FLUORINE CONTENT OF AN HCI GAS CONTAINIG SIF4 AS FLUORINE IMPURITY, WHICH COMPRISES CONTACTING SAID GAS TWITH MATERIAL OF THE GROUP CONSISTING OF BORIC ACID AND ITS SALTS SUSPENDED ON AN INORGANIC OXYGENATED SILICON COMPOUND REACTIVE WITH HF, AND REGULATING THE TIME OF CONTACT OF SAID GAS WITH SAID MATERIAL SO AS TO REDUCE THE FLUORINE CONTENT OF SAID GAS TO EQUIVALENT TO LESS THAN 0.1% BY VOLUME OF HF.
Claim 2
Dependent Claim
91 words
THE PROCESS OF REDUCING THE FLUORINE CONTENT OF AN HCI GAS CONTAINING HF AS AN IMPURITY WHICH PROCESS COMPRISES CONTACTING SAID GAS WITH AN INORGANIC OXYGENATED SILICON COMPOUND REACTIVE AT ABOUT ROOM TEMPERATURE WITH HF UNDER CONDITIONS TO CONVERT SAID HF TO SIF4 TO FORM A RESULTING GAS COMPRISING SIF4, AND CONTACTING SAID RESULTING GAS WITH BORIC ACID SUSPENDED ON FULLER''S EARTH AT A TEMPERATURE AND FOR A PERIOD OF TIME SUFFICIENT TO REDUCE THE FLUORINE CONTENT OF SAID RESULTING GAS TO EQUIVALENT TO LESS THAN 0.1% BY VOLUME OF HF.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-23 | 1954-04-24 | 1954-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-23 | 1958-04-24 | 1958-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-23 | 1962-04-24 | 1962-10-24 | $7700.00 | Window Closed / Lapsed |