Patent US2865743A successfully refreshed from Google Patents.
US2865743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ketene dimer sizing composition and process for sizing paper therewith
Assignee: Hercules Powder Co
•
Filing: 1957-03-11
•
Granted: 1958-12-23
•
Expires: 1977-03-11
Abstract
No abstract record available.
Inventors
- 👤 Cyrus A Weisgerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:57
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/88; C07C45/00; C07C45/87; D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/69
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
94 words
THE PROCESS OF SIZING PAPER WHICH COMPRISES FORM ING AN AQUEOUS SUSPENSION OF PAPER PULP, INCORPORATING IN THE AQUEOUS SUSPENSION A SIZING COMPOSITION COMPRISING A FREE-FLOWING POWDER MADE UP OF FINELY-DIVIDED SILICA PARTICLES HAVING DEPOSITED THEREON A KETENE DIMER, SAID COATED PARTICLES HAVING A PARTICLE SIZE NOT IN EXCESS OF ABOUT 74 MICRONS, SAID KETENE DIMER HAVING THE FORMULA (RCH=C=O)2 WHERE R IS A HYDROCARBON RADICAL, SUCH AS ALKYL HAVING AT LEAST 8 CARBON ATOMS, CYCLOALKYL HAVING AT LEAST 6 CARBON ATOMS, ARYL, ARALKYL AND ALKARYL, AND THEN FORMING THE AQUEOUS SUSPENSION INTO SHEETS.
References Cited (Backward Citations)
US2510661A
Cited
US2627477A
Cited
US2762270A
Cited
US2728732A
Cited
US2706163A
Cited
US2776226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |