Patent US2776277A successfully refreshed from Google Patents.
US2776277A
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Diels-alder reaction
Assignee: Hercules Powder Co
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Filing: 1953-06-29
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Granted: 1957-01-01
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Expires: 1973-06-29
Abstract
No abstract record available.
Inventors
- 👤 Gerald I Keim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:59
CPC Classifications
C; C09; C09F; C09F1/00; C09F1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
IN THE PROCESS OF FORMING A DIELS-ALDER REACTION PRODUCT OF A ROSIN AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF MALEIC ACID AND MALEIC ANHYDRIDE, THE IMPROVEMENT WHICH COMPRISES ACID ISOMERIZING THE ROSIN TO A NEGATIVE SPECIFIC ROTATION (A)D24* OF AT LEAST -15* BEFOR FORMATION OF THE DIELS-ALDER PRODUCT.
Claim 2
Dependent Claim
50 words
IN THE PROCESS OF FORMING A DIELS-ALDER REACTION PRODUCT OF A ROSIN AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF MALEIC ACID AND MALEIC ANHYDRIDE, THE IMPROVEMENT WHICH COMPRISES ACID ISOMERIZING THE ROSIN TO A NEGATIVE SPECIFIC ROTATION (A)D24* OF AT LEAST -15* BEFOR FORMATION OF THE DIELS-ALDER PRODUCT.
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) | 1960-01-01 | 1960-07-02 | 1961-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-01 | 1964-07-02 | 1965-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-01 | 1968-07-02 | 1969-01-01 | $7700.00 | Window Closed / Lapsed |