US2550744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halogen derivatives of tetrahydrophthalic acid and processes for producing same
Assignee: Publicker Ind Inc
•
Filing: 1945-07-17
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Granted: 1951-05-01
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Expires: 1965-07-17
Abstract
No abstract record available.
Inventors
- 👤 Richard S Wilder
- 👤 George D Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:48
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/363; C07C51/54; C07C61/00; C07C61/08; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A PROCESS OF THE CHARACTER DESCRIBED WHICH COMPRISES MIXING ABOUT 152 PARTS OF TETRAHYDROPHTHALIC ANHYDRIDE WITH ABOUT 250 PARTS OF GLACIAL ACETIC ACID AND PASSING IN CHLORINE WITH AGITATION AT A TEMPERATURE OF ABOUT 10-20* C. UNTIL ABOUT 66 PARTS OF CHLORINE HAS BEEN ABSORBED, AND HEATING THE MIXTURE TO ABOUT 160* C. TO DISTILL OFF ACETIC ACID.
Claim 2
Dependent Claim
58 words
A PROCESS OF THE CHARACTER DESCRIBED WHICH COMPRISES MIXING ABOUT 152 PARTS OF TETRAHYDROPHTHALIC ANHYDRIDE WITH ABOUT 250 PARTS OF GLACIAL ACETIC ACID AND PASSING IN CHLORINE WITH AGITATION AT A TEMPERATURE OF ABOUT 10-20* C. UNTIL ABOUT 66 PARTS OF CHLORINE HAS BEEN ABSORBED, AND HEATING THE MIXTURE TO ABOUT 160* C. TO DISTILL OFF ACETIC ACID.
References Cited (Backward Citations)
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |