Patent US3449087A successfully refreshed from Google Patents.
US3449087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification by selective crystallization and remelt
Assignee: COMMERCE USA
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Filing: 1966-06-27
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Granted: 1969-06-10
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Expires: 1986-06-27
Abstract
No abstract record available.
Inventors
- 👤 Charles Proffer Saylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:22
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/02; C30B13/16; C30B13/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
THE PROCESS OF PURIFYING A MATERIAL CONTAINED WITHIN AN ELONGATED TUBULAR RECEPTACLE BETWEEN TWO SPACED-APART TRANSVERSE BOUNDARIES THEREIN, WHICH COMPRISES: (A) MAINTAINING THE REGIONS ADJACENT SAID BOUNDARIES AND AT LEAST ONE INTERCONNECTING NARROW ZIGZAG REGION RELATIVELY HOT AND THE REMAINING REGIONS RELATIVELY COLD SO THAT THE MATERIAL WITHIN SAID HOT REGIONS IS LIQUID AND THE MATERIAL IN SIAD COLD REGIONS IS SOLID; (B) RELATIVELY MOVING BOTH OF SAID SPACED APART TRANSVERSE BOUNDARIES AND THE MATERIAL THEREBETWEEN THROUGH SAID TUBULAR RECEPTACLE; (C) WITHDRAWING LIQUID MATERIAL FROM SAID REGIONS ADJACENT SAID BOUNDARIES; AND (D) ADDING LIQUID FEED MATERIAL TO SAID INTERCONNECTING NARROW ZIGZAG REGION.
Claim 2
Dependent Claim
102 words
THE PROCESS OF PURIFYING A MATERIAL CONTAINED WITHIN AN ELONGATED TUBULAR RECEPTACLE BETWEEN TWO SPACED-APART TRANSVERSE BOUNDARIES THEREIN, WHICH COMPRISES: (A) MAINTAINING THE REGIONS ADJACENT SAID BOUNDARIES AND AT LEAST ONE INTERCONNECTING NARROW ZIGZAG REGION RELATIVELY HOT AND THE REMAINING REGIONS RELATIVELY COLD SO THAT THE MATERIAL WITHIN SAID HOT REGIONS IS LIQUID AND THE MATERIAL IN SIAD COLD REGIONS IS SOLID; (B) RELATIVELY MOVING BOTH OF SAID SPACED APART TRANSVERSE BOUNDARIES AND THE MATERIAL THEREBETWEEN THROUGH SAID TUBULAR RECEPTACLE; (C) WITHDRAWING LIQUID MATERIAL FROM SAID REGIONS ADJACENT SAID BOUNDARIES; AND (D) ADDING LIQUID FEED MATERIAL TO SAID INTERCONNECTING NARROW ZIGZAG REGION.
References Cited (Backward Citations)
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Cited
US2787890A
Cited
US2750262A
Cited
US2866322A
Cited
US3019092A
Cited
US3177051A
Cited
US2992311A
Cited
US3310383A
Cited
US3284172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |