Patent US2786897A successfully refreshed from Google Patents.
US1935264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esters of sulphonated aromatic carboxylic acids and peocess of making same
Assignee: FIRM OF SCOIETY OF CHEMICAL IN
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Filing: 1931-03-13
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Granted: 1933-11-14
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Expires: 1951-03-13
Abstract
No abstract record available.
Inventors
- 👤 Felix Friedrich
- 👤 Albrecht Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:56
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/02; C07C303/22; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-11-13 | 1937-05-15 | 1937-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-11-13 | 1941-05-15 | 1941-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-11-13 | 1945-05-15 | 1945-11-14 | $7700.00 | Window Closed / Lapsed |