US3341490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of two polysiloxane copolymers with silica
Assignee: Dow Silicones Corp
•
Filing: 1964-08-13
•
Granted: 1967-09-12
•
Expires: 1984-08-13
Abstract
No abstract record available.
Inventors
- 👤 Duane F Burdick
- 👤 James L Mishler
- 👤 Keith E Polmanteer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:49
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/20; C08G77/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A COMPOSITION CONSISTING ESSENTIALLY OF 60 TO 70 PARTS OF A DIMETHYLVINYLSILYL ENDBLOCKED COPOLYMER CONSISTING ESSENTIALLY OF ABOUT 6 TO 9 MOL PERCENT OF PHENYLMETHYLSILOXANE UNITS, ABOUT 0.1 TO 0.2 MOL PERCENT OF VINYL-METHYLSILOXANE UNITS AND THE BALANCE ESSENTIALLY DIMETHYLSILOXANE UNITS AND 30 TO 40 PARTS OF A DIMETHYLVINYLSILYL ENDBLOCKED COPOLYMER CONSISTING ESSENTIALLY OF ABOUT 15 TO 25 MOL PERCENT OF METHYLVINYLSILOXANE UNITS, ABOUT 4 TO 6 MOL PERCENT OF PHENYLMETHYLSILOXANE UNITS AND THE BALANCE ESSENTAILLY DIMETHYLSILOXANE UNITS, THERE BEING A TOTAL OF 100 PARTS OF THE TWO POLYMERS IN THE COMPOSITION, SAID PARTS BEING A WEIGHT BASIS.
Claim 2
Dependent Claim
98 words
A COMPOSITION CONSISTING ESSENTIALLY OF 60 TO 70 PARTS OF A DIMETHYLVINYLSILYL ENDBLOCKED COPOLYMER CONSISTING ESSENTIALLY OF ABOUT 6 TO 9 MOL PERCENT OF PHENYLMETHYLSILOXANE UNITS, ABOUT 0.1 TO 0.2 MOL PERCENT OF VINYL-METHYLSILOXANE UNITS AND THE BALANCE ESSENTIALLY DIMETHYLSILOXANE UNITS AND 30 TO 40 PARTS OF A DIMETHYLVINYLSILYL ENDBLOCKED COPOLYMER CONSISTING ESSENTIALLY OF ABOUT 15 TO 25 MOL PERCENT OF METHYLVINYLSILOXANE UNITS, ABOUT 4 TO 6 MOL PERCENT OF PHENYLMETHYLSILOXANE UNITS AND THE BALANCE ESSENTAILLY DIMETHYLSILOXANE UNITS, THERE BEING A TOTAL OF 100 PARTS OF THE TWO POLYMERS IN THE COMPOSITION, SAID PARTS BEING A WEIGHT BASIS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |