Patent US2836620A successfully refreshed from Google Patents.
US2836620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amino sulfonic acids and salts thereof
Assignee: Dow Chemical Co
•
Filing: 1954-03-17
•
Granted: 1958-05-27
•
Expires: 1974-03-17
Abstract
No abstract record available.
Inventors
- 👤 Frederick C Bersworth
- 👤 Arthur E Martell
- 👤 Roger G Lacoste
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:49
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3834
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
AMINO SULFONIC ACID COMPOUNDS IN ACCORDANCE WITH THE FOLLOWING GENERIC FORMULA:
Claim 2
Dependent Claim
11 words
AMINO SULFONIC ACID COMPOUNDS IN ACCORDANCE WITH THE FOLLOWING GENERIC FORMULA:
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) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |