US3274154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of cyclic siloxanes
Assignee: Midland Silicones Ltd
•
Filing: 1963-07-17
•
Granted: 1966-09-20
•
Expires: 1983-07-17
Abstract
No abstract record available.
Inventors
- 👤 Kendrick Thomas Charles
- 👤 Thomas David Randall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:10
CPC Classifications
C; C08; C08G; C08G77/00; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A METHOD OF POLYMERIZING CYCLIC DIORGANOSILOXANES OF THE GENERAL FORMULA (RR''SIO)N WHERE EACH R AND EACH R'' ARE INDIVIDUALLY SELECTED FROM THE GROUP CONSISTING OF HYDROGEN ATOMS, MONOVALENT HYDROCARBON RADICALS, MONOVALENT HALOGENATED HYDROCARBON RADICALS AND AMINOALKYL RADICALS AND N IS AN INTEGER HAVING A VALUE OF AT LEAST 3, CONSISTING ESSENTIALLY OF CONTACTING THE CYCLIC DIORGANOSILOXANES WITH (1) AN ANHYDROUS ACID HAVING A DISSOCIATION CONSTANT IN AQUEOUS SOLUTION OF AT LEAST 10**5 AND (2) A HALIDE SELECTED FROM THE GROUP CONSISTING OF HALIDES OF AL, SI, P, SC, TI, V, GA, GE, AS, Y, ZR, NB, IN, SN, SB, TL, HF, TA, PB, BI, FE, CO, NI, RU, RH, PD, OS, IR AND PT, AND SUBSTITUTED COVALENT HALIDE PHENYLDICHLOROPHOSPHINE, AT A TEMPERATURE UP TO 100*C.
Claim 2
Independent Claim
125 words
A METHOD OF POLYMERIZING CYCLIC DIORGANOSILOXANES OF THE GENERAL FORMULA (RR''SIO)N WHERE EACH R AND EACH R'' ARE INDIVIDUALLY SELECTED FROM THE GROUP CONSISTING OF HYDROGEN ATOMS, MONOVALENT HYDROCARBON RADICALS, MONOVALENT HALOGENATED HYDROCARBON RADICALS AND AMINOALKYL RADICALS AND N IS AN INTEGER HAVING A VALUE OF AT LEAST 3, CONSISTING ESSENTIALLY OF CONTACTING THE CYCLIC DIORGANOSILOXANES WITH (1) AN ANHYDROUS ACID HAVING A DISSOCIATION CONSTANT IN AQUEOUS SOLUTION OF AT LEAST 10**5 AND (2) A HALIDE SELECTED FROM THE GROUP CONSISTING OF HALIDES OF AL, SI, P, SC, TI, V, GA, GE, AS, Y, ZR, NB, IN, SN, SB, TL, HF, TA, PB, BI, FE, CO, NI, RU, RH, PD, OS, IR AND PT, AND SUBSTITUTED COVALENT HALIDE PHENYLDICHLOROPHOSPHINE, AT A TEMPERATURE UP TO 100*C.
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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |