Patent US2681355A successfully refreshed from Google Patents.
US2681355A
Expired / Lapsed
US
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Method of preparing organosilanes
Assignee: Dow Silicones Corp
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Filing: 1953-02-20
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Granted: 1954-06-15
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Expires: 1973-02-20
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Barry
- 👤 John W Gilkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:16
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/121; C07F7/128
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A METHOD OF PREPARING METHYLCHLOROSILANES WHICH COMPRISES HEATING THE RESIDUE BOILING ABOVE DIEMTHYLDICHLOROSILANE, WHICH RESIDUE WAS FORMED DURING THE REACTION OF METHYLCHLORIDE WITH SILICON, AND HCI AT A TEMPERATURE OF FROM 200* C. TO 900* C., THE HCI BEING PRESENT IN AMOUNT OF AT LEAST 4 PER CENT BY WEIGHT BASED ON THE WEIGHT OF THE RESIDUE.
Claim 2
Independent Claim
57 words
A METHOD OF PREPARING METHYLCHLOROSILANES WHICH COMPRISES HEATING THE RESIDUE BOILING ABOVE DIEMTHYLDICHLOROSILANE, WHICH RESIDUE WAS FORMED DURING THE REACTION OF METHYLCHLORIDE WITH SILICON, AND HCI AT A TEMPERATURE OF FROM 200* C. TO 900* C., THE HCI BEING PRESENT IN AMOUNT OF AT LEAST 4 PER CENT BY WEIGHT BASED ON THE WEIGHT OF THE RESIDUE.
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) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |