Patent US2801907A successfully refreshed from Google Patents.
US2801907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of crystals of uniform size
Assignee: Phillips Petroleum Co
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Filing: 1952-01-02
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Granted: 1957-08-06
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Expires: 1972-01-02
Abstract
No abstract record available.
Inventors
- 👤 John B Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:27
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0018; B01D9/0036
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
IN THE ART OF PRODUCING CRYSTALS, THE STEPS WHICH CONSIST IN MAINTAINING A SUSPENSION OF CRYSTALS IN AN AQUEOUS MOTHER LIQUOR, CONTINUOUSLY WITHDRAWING LIQUID FROM SAID SUSPENSION, CONTINUOUSLY INTRODUCTING INTO SAID SUSPENSION A SUPERSATURATED SOLUTION OF THE MATERIAL FROM WHICH THE CRYSTALS ARE FORMED, THEREBY TO PROVIDE ADDITIONAL CRYSTALS IN THE SUSPENSION, CONTINUOUSLY WITHDRAWING A STREAM OF AIR CRYSTALS FROM SAID SUSPENSION, INTRODUCTING A STREAN OF AIR UNDER PRESSURE INTO SAID SUSPENSION, VARYING SAID PRESSURE UNTIL IT IS JUST SUFFICIENT TO CAUSE AIR TO BUBBLE THROUGH THE SUSPENSION, WHEREBY SAID PRESSURE IS DIRECTLY PROPORTIONAL TO HE WEIGHT OF SAID SUSPENSION, MEASSURING SAID PRESSURE, AND VARYING THE AMOUNT OF CRYSTALS WITHDRAWN FROM SAID SUSPENSION TO MAINTAIN SAID PRESSURE AT A SUBSTANTIALLY CONSTANT VALUE.
Claim 2
Dependent Claim
122 words
IN THE ART OF PRODUCING CRYSTALS, THE STEPS WHICH CONSIST IN MAINTAINING A SUSPENSION OF CRYSTALS IN AN AQUEOUS MOTHER LIQUOR, CONTINUOUSLY WITHDRAWING LIQUID FROM SAID SUSPENSION, CONTINUOUSLY INTRODUCTING INTO SAID SUSPENSION A SUPERSATURATED SOLUTION OF THE MATERIAL FROM WHICH THE CRYSTALS ARE FORMED, THEREBY TO PROVIDE ADDITIONAL CRYSTALS IN THE SUSPENSION, CONTINUOUSLY WITHDRAWING A STREAM OF AIR CRYSTALS FROM SAID SUSPENSION, INTRODUCTING A STREAN OF AIR UNDER PRESSURE INTO SAID SUSPENSION, VARYING SAID PRESSURE UNTIL IT IS JUST SUFFICIENT TO CAUSE AIR TO BUBBLE THROUGH THE SUSPENSION, WHEREBY SAID PRESSURE IS DIRECTLY PROPORTIONAL TO HE WEIGHT OF SAID SUSPENSION, MEASSURING SAID PRESSURE, AND VARYING THE AMOUNT OF CRYSTALS WITHDRAWN FROM SAID SUSPENSION TO MAINTAIN SAID PRESSURE AT A SUBSTANTIALLY CONSTANT VALUE.
References Cited (Backward Citations)
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US2037595A
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US2091898A
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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) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |