Patent US2724643A successfully refreshed from Google Patents.
US2724643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halohydrocarbyl substituted aromatic acids and derivatives thereof
Assignee: Shell Development Co
•
Filing: 1950-12-04
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Granted: 1955-11-22
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Expires: 1970-12-04
Abstract
No abstract record available.
Inventors
- 👤 Rupert C Morris
- 👤 Vernon W Buls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:05
CPC Classifications
C; C07; C07C; C07C63/00; C07C63/68; C07C63/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
2 words
(CHLORO-TERT-BUTYL)BENZOIC ACID.
Claim 2
Dependent Claim
2 words
(CHLORO-TERT-BUTYL)BENZOIC ACID.
References Cited (Backward Citations)
US1014859A
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US1022645A
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US1482416A
Cited
US1715251A
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US1953629A
Cited
US1982787A
Cited
US1889383A
Cited
US1975054A
Cited
US2157697A
Cited
US2275312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-21 | 1959-05-23 | 1959-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-21 | 1963-05-23 | 1963-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-21 | 1967-05-23 | 1967-11-22 | $7700.00 | Window Closed / Lapsed |