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Patent US2809972A successfully refreshed from Google Patents.
US2809972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1, 1, 2, 2,-tetracyanoethanesulfonic acid and salts thereof
Assignee: EIDP Inc
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Filing: 1956-04-26
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Granted: 1957-10-15
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Expires: 1976-04-26
Abstract
No abstract record available.
Inventors
- 👤 Middleton William Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:19
CPC Classifications
C; C07; C07C; C07C309/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 1,1,2,2-TETRACYANOETHANESULFONIC ACID AND 1,1,2,2-TETRACYANOETHANESULFONATE SALTS THEREOF.
Claim 2
Dependent Claim
14 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 1,1,2,2-TETRACYANOETHANESULFONIC ACID AND 1,1,2,2-TETRACYANOETHANESULFONATE SALTS THEREOF.
References Cited (Backward Citations)
US2462406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |