Patent US2929838A successfully refreshed from Google Patents.
US2929838A
Expired / Lapsed
US
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Halogenated coal acids
Assignee: Dow Chemical Co
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Filing: 1957-09-19
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Granted: 1960-03-22
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Expires: 1977-09-19
Abstract
No abstract record available.
Inventors
- 👤 Herbert B Rickert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:52
CPC Classifications
C; C07; C07C; C07C63/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
HALOGENATED COAL ACIDS CONTAINING UP TO ABOUT 45 WEIGHT PERCENT, BASED ON THE WEIGHT OF THE COMPOSITION, OF COMBINED HALOGEN WHEREIN THE HALOGEN SUBSTITUENTS ARE SELECTED FROM THE GROUP OF HALOGENS CONSISTING OF CHLORINE, BROMINE AND THEIR MIXTURES, SAID COAL ACIDS BEIGN THE WATER-SOLUBLE, MIXED AROMATIC POLYCARBOXYLIC ACIDS THAT ARE THE PRODUCTS OF THE OXIDATION OF CARBONACEOUS MATERIALS, WHICH ACIDS TYPICALLY HAVE AN AVERAGE MOLECULAR WEIGHT OF FROM 200 TO 300, AND AVERAGE APPARENT EQUIVALENT WEIGHT OF FROM 70 TO 90, AND CONTAIN AN AVERAGE OF FROM ABOUT 2.5 TO 5 CARBOXYLIC GROUPS PER AROMATIC NUCLEUS IN THEIR MOLECULE.
Claim 2
Dependent Claim
99 words
HALOGENATED COAL ACIDS CONTAINING UP TO ABOUT 45 WEIGHT PERCENT, BASED ON THE WEIGHT OF THE COMPOSITION, OF COMBINED HALOGEN WHEREIN THE HALOGEN SUBSTITUENTS ARE SELECTED FROM THE GROUP OF HALOGENS CONSISTING OF CHLORINE, BROMINE AND THEIR MIXTURES, SAID COAL ACIDS BEIGN THE WATER-SOLUBLE, MIXED AROMATIC POLYCARBOXYLIC ACIDS THAT ARE THE PRODUCTS OF THE OXIDATION OF CARBONACEOUS MATERIALS, WHICH ACIDS TYPICALLY HAVE AN AVERAGE MOLECULAR WEIGHT OF FROM 200 TO 300, AND AVERAGE APPARENT EQUIVALENT WEIGHT OF FROM 70 TO 90, AND CONTAIN AN AVERAGE OF FROM ABOUT 2.5 TO 5 CARBOXYLIC GROUPS PER AROMATIC NUCLEUS IN THEIR MOLECULE.
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) | 1963-03-22 | 1963-09-21 | 1964-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-22 | 1967-09-21 | 1968-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-22 | 1971-09-21 | 1972-03-22 | $7700.00 | Window Closed / Lapsed |