US3175881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing crystalline ammonium metatungstate
Assignee: GTE Sylvania Inc
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Filing: 1962-07-10
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Granted: 1965-03-30
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Expires: 1982-07-10
Abstract
No abstract record available.
Inventors
- 👤 Chiola Vincent
- 👤 Jr John M Laferty
- 👤 Clarence D Vanderpool
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:06
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/30; C; C01; C01G; C01G41/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
THE METHOD OF PRODUCING AMMONIUM METATUNGSTATE CRYSTALS WHICH COMPRISES HEATING AMMONIUM PARATUNGSTATE AT A TEMPERATURE WITHIN THE RANGE OF 300*F. TO 700* F. UNTIL AN AQUEOUS SLURRY CONTAINING ABOUT 9% BY WEIGHT OF THE MATERIAL SO HEATED EXHIBITS A PH OF BETWEEN 3 AND 5; MIXING THE MATERIAL WITH WATER AT A TEMPERATURE IN THE RANGE FROM ABOVE ABOUT 70*C. TO BELOW THE BOILING POINT OF WATER TO FORM A SLURRRY THEREOF CONTAINING FROM ABOUT 9% TO ABOUT 10% OF THE MATERIAL ; MAINTAINING THE SLURRY AT A TEMPERATURE IN THE AFORESAID RANGE AND ADDING AMMONIUM HYDROXIDE THERETO AS NEEDED TO MAILNTAIN THE SLURRY AT A PH OF FROM ABOUT 3.0 TO ABOUT 5.0 UNTIL THE SLURRY HAS BEEN REDUCED TO ABOUT ONE-THIRD OF ITS ORIGINAL VOLUME; FILTERING THE CONCENTRATED SLURRY; AND CRYSTALLIZING AMMONIUM METATUNGSDTATE FROM THE FILTRATE.
Claim 2
Independent Claim
138 words
THE METHOD OF PRODUCING AMMONIUM METATUNGSTATE CRYSTALS WHICH COMPRISES HEATING AMMONIUM PARATUNGSTATE AT A TEMPERATURE WITHIN THE RANGE OF 300*F. TO 700* F. UNTIL AN AQUEOUS SLURRY CONTAINING ABOUT 9% BY WEIGHT OF THE MATERIAL SO HEATED EXHIBITS A PH OF BETWEEN 3 AND 5; MIXING THE MATERIAL WITH WATER AT A TEMPERATURE IN THE RANGE FROM ABOVE ABOUT 70*C. TO BELOW THE BOILING POINT OF WATER TO FORM A SLURRRY THEREOF CONTAINING FROM ABOUT 9% TO ABOUT 10% OF THE MATERIAL ; MAINTAINING THE SLURRY AT A TEMPERATURE IN THE AFORESAID RANGE AND ADDING AMMONIUM HYDROXIDE THERETO AS NEEDED TO MAILNTAIN THE SLURRY AT A PH OF FROM ABOUT 3.0 TO ABOUT 5.0 UNTIL THE SLURRY HAS BEEN REDUCED TO ABOUT ONE-THIRD OF ITS ORIGINAL VOLUME; FILTERING THE CONCENTRATED SLURRY; AND CRYSTALLIZING AMMONIUM METATUNGSDTATE FROM THE FILTRATE.
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) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |