Patent US541869A successfully refreshed from Google Patents.
Patent US2507513A successfully refreshed from Google Patents.
US2507513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of hexaorganodisilapropanes
Assignee: Dow Silicones Corp
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Filing: 1948-04-20
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Granted: 1950-05-16
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Expires: 1968-04-20
Abstract
No abstract record available.
Inventors
- 👤 Jr John T Goodwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:47
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0803; C07F7/0805
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
THE METHOD OF PREPARING COMPOUNDS OF THE TYPE R3SICH2SIR3 IN WHICH R IS A MEMBER OF THE CLASS CONSISTING OF ALKYL AND MONOCYCLICARYL RADICALS WHICH COMPRISES REACTING A COMPOUND OF THE TYPE R3SIX, IN WHICH X IS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE, WITH A COMPOUND OF THE TYPE R3SICH2X BY CONTACTING THE LATTER IN LIQUID PHASE WITH A ALKALI METAL IN THE PRESENCE OF THE FORMER COMPOUND IN LIQUID PHASE.
Claim 2
Independent Claim
74 words
THE METHOD OF PREPARING COMPOUNDS OF THE TYPE R3SICH2SIR3 IN WHICH R IS A MEMBER OF THE CLASS CONSISTING OF ALKYL AND MONOCYCLICARYL RADICALS WHICH COMPRISES REACTING A COMPOUND OF THE TYPE R3SIX, IN WHICH X IS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE, WITH A COMPOUND OF THE TYPE R3SICH2X BY CONTACTING THE LATTER IN LIQUID PHASE WITH A ALKALI METAL IN THE PRESENCE OF THE FORMER COMPOUND IN LIQUID PHASE.
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) | 1953-05-15 | 1953-11-14 | 1954-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-15 | 1957-11-14 | 1958-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-15 | 1961-11-14 | 1962-05-16 | $7700.00 | Window Closed / Lapsed |