US2887475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rosin having improved characteristics for use in size and rosin sizing compositions prepared therefrom
Assignee: Hercules Powder Co
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Filing: 1956-12-18
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Granted: 1959-05-19
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Expires: 1976-12-18
Abstract
No abstract record available.
Inventors
- 👤 Spencer H Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:45
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/62
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
78 words
THE PROCESS WHICH COMPRISES SUBJECTING ROSIN TO A DISPORPORTIONATION TREATMENT UNTIL IT CONTAINS LESS THAN ABOUT 5% ABIETIC ACID, SUBJECTING THE RESULTING DISPROPORTIONATED ROSIN TO DISTILLATION UNDER REDUCED PRESSURE TO SEPARATE THE SAME INTO A LOW-BOILING FRACTION CONSISTING OF FROM ABOUT 3-15% BY WEIGHT OF THE ROSIN AND A RESIDUAL FRACTION CONSISTING OF THE UNDISTILLED RESIDUE REMAINING AFTER THE LOW-BOILING FRACTION HAS BEEN REMOVED, AND REACTING THE RESIDUAL FRACTION WITH AN ALKALI TO FORM AN IMPROVED SIZING COMPOSITION.
Claim 2
Dependent Claim
78 words
THE PROCESS WHICH COMPRISES SUBJECTING ROSIN TO A DISPORPORTIONATION TREATMENT UNTIL IT CONTAINS LESS THAN ABOUT 5% ABIETIC ACID, SUBJECTING THE RESULTING DISPROPORTIONATED ROSIN TO DISTILLATION UNDER REDUCED PRESSURE TO SEPARATE THE SAME INTO A LOW-BOILING FRACTION CONSISTING OF FROM ABOUT 3-15% BY WEIGHT OF THE ROSIN AND A RESIDUAL FRACTION CONSISTING OF THE UNDISTILLED RESIDUE REMAINING AFTER THE LOW-BOILING FRACTION HAS BEEN REMOVED, AND REACTING THE RESIDUAL FRACTION WITH AN ALKALI TO FORM AN IMPROVED SIZING COMPOSITION.
Claim 3
Dependent Claim
41 words
THE PROCESS OF CLAIM 1 WHEREIN THE DIPROPORTIONATION TREATMENT IS CARRIED OUT IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF PALLADIUM, PLATUNUM, NICKEL, IODINE AND SULFUR AT A TEMPERATURE FROM ABOUT 200* C. TO ABOUT 310* C.
Claim 4
Dependent Claim
13 words
A ROSIN SIZE COMPOSITION PRODUCED IN ACCORDANCE WITH THE PROCESS OF CLAIM 2.
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) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |