Patent US2736721A successfully refreshed from Google Patents.
US2736721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optionally
Assignee: —
•
Filing: 1953-04-01
•
Granted: 1956-02-28
•
Expires: 1973-04-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:27
CPC Classifications
C; C09; C09J; C09J183/00; C09J183/04; C08; C08L; C08L83/00; C09J183/08; C08L2666/00; C08L2666/28; C08L2666/52; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2852
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
AS A COMPOSITION OF MATTER A MIXTURE COMPRISING (A) 5 TO 7 PER CENT BY WEIGHT OF A BENZENE SOLUBLE RESIN COPOLYMER COMPOSED ESSENTIALLY OF STRUCTURAL UNITS OF SIO2 AND R3SIO 1/2 WHERE R IS A MONOVALENT HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF ALKYL RADICALS OF LESS THAN 4 CARBON ATOMS AND PHENYL AND AT LEAST 90 PER CENT OF THE TOTAL NUMBER OF R RADICALS ARE ALKYL AND IN SAID COPOLYMER THE RATIO OF R3SIO 1/2 UNITS TO SIO2 UNITS IS BETWEEN 0.6 TO 0.9 INCLUSIVE AND (B) 95 TO 30 PER CENT BY WEIGHT OF A BENZENE SOLUBLE ORGANOSILOXANE OF AT LEAST 1,000,000 CENTISTOKES VISCOSITY AT 25* C., SAID ORAGANOSILOXANE HAVING THE GENERAL FORMULA R''2SIO WHERE R'' IS A MONOVALENT HYDROCARBON RADICAL SELECTED FROM THE GROUP CONSISTING OF METHYL AND PHENYL AND AT LEAST 90 PERCENT OF THE TOTAL NUMBER OF R'' RADICALS ARE METHYL.
Claim 2
Dependent Claim
148 words
AS A COMPOSITION OF MATTER A MIXTURE COMPRISING (A) 5 TO 7 PER CENT BY WEIGHT OF A BENZENE SOLUBLE RESIN COPOLYMER COMPOSED ESSENTIALLY OF STRUCTURAL UNITS OF SIO2 AND R3SIO 1/2 WHERE R IS A MONOVALENT HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF ALKYL RADICALS OF LESS THAN 4 CARBON ATOMS AND PHENYL AND AT LEAST 90 PER CENT OF THE TOTAL NUMBER OF R RADICALS ARE ALKYL AND IN SAID COPOLYMER THE RATIO OF R3SIO 1/2 UNITS TO SIO2 UNITS IS BETWEEN 0.6 TO 0.9 INCLUSIVE AND (B) 95 TO 30 PER CENT BY WEIGHT OF A BENZENE SOLUBLE ORGANOSILOXANE OF AT LEAST 1,000,000 CENTISTOKES VISCOSITY AT 25* C., SAID ORAGANOSILOXANE HAVING THE GENERAL FORMULA R''2SIO WHERE R'' IS A MONOVALENT HYDROCARBON RADICAL SELECTED FROM THE GROUP CONSISTING OF METHYL AND PHENYL AND AT LEAST 90 PERCENT OF THE TOTAL NUMBER OF R'' RADICALS ARE METHYL.
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) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |