Patent US2816882A successfully refreshed from Google Patents.
US2816882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ymeric surface active agents
Assignee: —
•
Filing: —
•
Granted: 1957-12-17
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Expires: 1974-12-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:16
CPC Classifications
—
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A SURFACE ACTIVE AGENT COMPRISING A COPOLYMER OF FROM ABONT 85 TO ABOUT 99 PARTS BY WEIGHT OF A MEMBER OF THE GROUP CONSISTING OF ACRYLEMIDE AND METHACRYLAMIDE AND FROM ABOUT 1 TO ABOUT 15 PARTS BY WEIGHT OF AN ALKYL ESTER OF AN ACID FROM THE GROUP CONSISTING OF ACRYLIC AND METHACRYLIC ACIDS, THE ALKYL GROUP IN SAID ESTERS CONTANING FROM EIGHT TO TWENTY-TWO CARBON ATOMS.
Claim 2
Dependent Claim
67 words
A SURFACE ACTIVE AGENT COMPRISING A COPOLYMER OF FROM ABONT 85 TO ABOUT 99 PARTS BY WEIGHT OF A MEMBER OF THE GROUP CONSISTING OF ACRYLEMIDE AND METHACRYLAMIDE AND FROM ABOUT 1 TO ABOUT 15 PARTS BY WEIGHT OF AN ALKYL ESTER OF AN ACID FROM THE GROUP CONSISTING OF ACRYLIC AND METHACRYLIC ACIDS, THE ALKYL GROUP IN SAID ESTERS CONTANING FROM EIGHT TO TWENTY-TWO 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) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |