US3249580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-curing organosilicon block copolymers containing polysilane blocks and organosilicon blocks
Assignee: Dow Silicones Corp
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Filing: 1962-07-25
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Granted: 1966-05-03
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Expires: 1982-07-25
Abstract
No abstract record available.
Inventors
- 👤 Beck Henry Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:55
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/60; C08G77/42; C08G77/44; C08G77/48
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
144 words
A COMPOSITION OF MATTER THAT IS STABLE IN THE ABSENCE OF OXYGEN, WHICH COMPOSITON COMPRISES (A) A BLOCK COPOLYMER COMPRISING (1) BLOCKS OF THE STRUCTURE (R2SI)X WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN ATOMS, ALKYL RADICALS, CYCLOALKYL RADICALS, ARYL RADICALS, ALKARYL RADICALS, ARALKYL RDICALS AND PERFLUOROALKYLETHYL RADICALS, THERE BEING AN AVERAGE OF AT LEAST 2 SILICON-BONDED HYDROGEN ATOMS PER POLYSILANE UNIT AND X HAS AN AVERAGE VALUE OF AT LEAST 3 AND (2) BLOCKS OF THE STRUCTURE (R''NSIR"4-N/2)Y, WHEREIN R'' IS SELECTED FROM THE GROUP CONSISTING OF MONOVALENT HYDROCARBON RADICALS AND MONOVALENT HALOHYDROCARBON RADICALS, R" IS SELECTED FROM THE GROUP CONSISTING OF DIVALENT OXYGEN ATOMS, DIVALENT HYDROCARBON RADICALS, DIVALENT HYDROCARBON ETHER RADICALS AND DIVALENT HALOARYLENE RADICALS, N HAS AN AVERAGE VALUE OF FROM 1 TO 2 INCLUSIVE AND Y HAS AN AVERAGE VALUE OF AT LEAST 5, AND (B) A FILLER.
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |