Patent US2849458A successfully refreshed from Google Patents.
US2849458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of sulfonates
Assignee: EIDP Inc
•
Filing: 1957-04-01
•
Granted: 1958-08-26
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Expires: 1977-04-01
Abstract
No abstract record available.
Inventors
- 👤 Isaac F Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:50
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/56; C07D307/64; Y; Y10; Y10S; Y10S8/00; Y10S8/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
THE SULFONATE OF A DILACTONE CORRESPONDING TO
Claim 2
Dependent Claim
7 words
THE SULFONATE OF A DILACTONE CORRESPONDING TO
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) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |