US2990419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Certificate of correction
Assignee: —
•
Filing: —
•
Granted: 1961-06-27
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Expires: 1978-06-27
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:55
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/10; C08G77/14; C08G77/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
THE METHOD OF PREPARING STABILIZED HIGH VISCOSITY ORGANOPOLYSILOXANE OILS CHARACTERIZED IN THAT (A) A FLUID MIXTURE IS PREPARED OF (1) A HYDROXYL ENDBLOCKED DIORGANOSILOXANE WHEREIN THE ORGANIC SUBSTITUENTS ARE SELECTED FROM THE GROUP CONSISTING OF MONOVALENT HYDROCARBON RADICALS, HALOGENATED MONOVALENT HYDROCARBON RADICALS AND THE TRIMETHYLSILMETHYLENE RADICAL, (2) A TRIORGANOSILYL ENDBLOCKED DIORGANOPOLYSILOXANE OF THE AVERAGE FORMULA R3SIO(R2SIO)ASIR3 WHERE R IS A SUBSTITUENT SELECTED FROM THE GROUP CONSISTING OF MONOVALENT HYDROCARBON RADICALS, HALOGENATED MONOVALENT HYDROCARBON RADICALS, AND A TRIMETHYLSILMETHYLENE RADICAL AND A HAS AN AVERAGE VALUE SUCH THAT THE SILOXANE HAS A VISCOSITY AT 25*C. OF FROM 1 TO 10,000 CS., AND (3) .0001 TO 1.0% BY WEIGHT OF THE TOTAL WEIGHT OF A PHOSPHOROUS-NITROGEN COMPOUND SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULAE (PNCL2)B WHERE B IS AN INTEGER GREATER THAN 2,
Claim 2
Independent Claim
133 words
THE METHOD OF PREPARING STABILIZED HIGH VISCOSITY ORGANOPOLYSILOXANE OILS CHARACTERIZED IN THAT (A) A FLUID MIXTURE IS PREPARED OF (1) A HYDROXYL ENDBLOCKED DIORGANOSILOXANE WHEREIN THE ORGANIC SUBSTITUENTS ARE SELECTED FROM THE GROUP CONSISTING OF MONOVALENT HYDROCARBON RADICALS, HALOGENATED MONOVALENT HYDROCARBON RADICALS AND THE TRIMETHYLSILMETHYLENE RADICAL, (2) A TRIORGANOSILYL ENDBLOCKED DIORGANOPOLYSILOXANE OF THE AVERAGE FORMULA R3SIO(R2SIO)ASIR3 WHERE R IS A SUBSTITUENT SELECTED FROM THE GROUP CONSISTING OF MONOVALENT HYDROCARBON RADICALS, HALOGENATED MONOVALENT HYDROCARBON RADICALS, AND A TRIMETHYLSILMETHYLENE RADICAL AND A HAS AN AVERAGE VALUE SUCH THAT THE SILOXANE HAS A VISCOSITY AT 25*C. OF FROM 1 TO 10,000 CS., AND (3) .0001 TO 1.0% BY WEIGHT OF THE TOTAL WEIGHT OF A PHOSPHOROUS-NITROGEN COMPOUND SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULAE (PNCL2)B WHERE B IS AN INTEGER GREATER THAN 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) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |