US2955144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for refining naphthalene
Assignee: Wyeth Holdings LLC
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Filing: 1958-06-18
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Granted: 1960-10-04
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Expires: 1978-06-18
Abstract
No abstract record available.
Inventors
- 👤 William E Sisco
- 👤 Shenian Popkin
- 👤 Melvin I Moyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:37
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/005; C07C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN A PROCESS OF REFINING CRUDE NAPHTHALENE BY ACIDWASHING AND DISTILLATION THE IMPROVEMENT WHICH COMPRISES FORMING AN AQUEOUS SLURRY OF THE CRUDE NAPHTHALENE, SAID SLURRY CONTAINING FOR EACH 100 PARTS BY WEIGHT OF NAPHTHALENE FROM ABOT 0.185 TO ABOUT 1.85 PARTS BY WEIGHT OF FORMALDEHYDE, SAID FORMALDEHYDE BEING ADDED AS AN AQUEOUS SOLUTION THEREOF, AND A TOTAL OF FROM ABOUT ONE TO ABOUT TEN PARTS BY WEIGHT OF SOLUBLE ORGANIC ACIDS SELECTED FROM THE GROUP CONSISTING OF THE ALKANE, BENZENE, NAPHTHALENE AND THIANAPHTHENE SULFONIC ACIDS, AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 80* TO ABOUT 120*C. AGITATING SAID SLURRY FOR FROM ONE MINUTE TO ONE HOUR, COLLECTING RESULTANT TREATED SOLIDS AND SUBJECTING COLLECTED SOLIDS TO SAID DISTILLATION.
Claim 2
Dependent Claim
119 words
IN A PROCESS OF REFINING CRUDE NAPHTHALENE BY ACIDWASHING AND DISTILLATION THE IMPROVEMENT WHICH COMPRISES FORMING AN AQUEOUS SLURRY OF THE CRUDE NAPHTHALENE, SAID SLURRY CONTAINING FOR EACH 100 PARTS BY WEIGHT OF NAPHTHALENE FROM ABOT 0.185 TO ABOUT 1.85 PARTS BY WEIGHT OF FORMALDEHYDE, SAID FORMALDEHYDE BEING ADDED AS AN AQUEOUS SOLUTION THEREOF, AND A TOTAL OF FROM ABOUT ONE TO ABOUT TEN PARTS BY WEIGHT OF SOLUBLE ORGANIC ACIDS SELECTED FROM THE GROUP CONSISTING OF THE ALKANE, BENZENE, NAPHTHALENE AND THIANAPHTHENE SULFONIC ACIDS, AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 80* TO ABOUT 120*C. AGITATING SAID SLURRY FOR FROM ONE MINUTE TO ONE HOUR, COLLECTING RESULTANT TREATED SOLIDS AND SUBJECTING COLLECTED SOLIDS TO SAID DISTILLATION.
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) | 1963-10-04 | 1964-04-04 | 1964-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-04 | 1968-04-04 | 1968-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-04 | 1972-04-04 | 1972-10-04 | $7700.00 | Window Closed / Lapsed |