Patent US2820808A successfully refreshed from Google Patents.
US2820808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic esters of sulfurous acid
Assignee: Uniroyal Inc
•
Filing: 1954-05-07
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Granted: 1958-01-21
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Expires: 1974-05-07
Abstract
No abstract record available.
Inventors
- 👤 Walter D Harris
- 👤 John W Zukel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:14
CPC Classifications
C; C07; C07C; C07C301/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A MIXED SULFITE DIESTER OF AN ALIPHATIC ALCOHOL HAVING 1 TO 12 CARBON ATOMS AND A MONOAROMATIC ETHER OF A POLYALKYLENE GLYCOL IN WHICH THE AROMATIC RADICAL HAS 6 TO 12 CARBON ATOMS AND IN WHICH THE ESTERIFYING RADICAL FROM THE POLYGLYCOL CONTAINS 2 TO 5 ALKYLENEOXIDE GROUPS EACH HAVING 2 TO 4 CARBON ATOMS.
Claim 2
Dependent Claim
55 words
A MIXED SULFITE DIESTER OF AN ALIPHATIC ALCOHOL HAVING 1 TO 12 CARBON ATOMS AND A MONOAROMATIC ETHER OF A POLYALKYLENE GLYCOL IN WHICH THE AROMATIC RADICAL HAS 6 TO 12 CARBON ATOMS AND IN WHICH THE ESTERIFYING RADICAL FROM THE POLYGLYCOL CONTAINS 2 TO 5 ALKYLENEOXIDE GROUPS EACH HAVING 2 TO 4 CARBON ATOMS.
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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |