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Patent US2697657A successfully refreshed from Google Patents.
US2697657A
Expired / Lapsed
US
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Oil-soluble surface-active agents and compositions containing them
Assignee: California Research LLC
•
Filing: 1951-12-22
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Granted: 1954-12-21
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Expires: 1971-12-22
Abstract
No abstract record available.
Inventors
- 👤 Richard D Stayner
- 👤 Robert A Stayner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:23
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/24; C10L1/2431; C09; C09K; C09K23/00; C09K23/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
OIL-SOLUBLE SURFACE-ACTIVE COMPOUNDS HAVING THE FORMULA: WHEREIN R1 AND R2 ARE ALKYL GROUPS OF FROM 9 TO 19 CARBON ATOMS, R IS A MEMBER OF THE GROUP CONSISTING OF HYDROGEN AND METHYL, X IS AN INTEGER OF 1 TO 3, AND R3 IS AN ALKYLENE GROUP OF FROM 1 TO 7 CARBON ATOMS.
Claim 2
Dependent Claim
53 words
OIL-SOLUBLE SURFACE-ACTIVE COMPOUNDS HAVING THE FORMULA: WHEREIN R1 AND R2 ARE ALKYL GROUPS OF FROM 9 TO 19 CARBON ATOMS, R IS A MEMBER OF THE GROUP CONSISTING OF HYDROGEN AND METHYL, X IS AN INTEGER OF 1 TO 3, AND R3 IS AN ALKYLENE GROUP OF FROM 1 TO 7 CARBON ATOMS.
References Cited (Backward Citations)
GB181750A
Cited
US2260384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |