US2607792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing dimethylpolysiloxane diols
Assignee: Dow Silicones Corp
•
Filing: 1949-04-27
•
Granted: 1952-08-19
•
Expires: 1969-04-27
Abstract
No abstract record available.
Inventors
- 👤 Warrick Earl Leathen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:29
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
THE METHOD OF PREPARING DIMETHYLPOLYLSILOXANE DIOLS WHICH COMPRISES HEATING A MIXTURE CONSISTING ESSENTIALLY OF A COMPLETELY CONDENSED DIMETHYLPOLYSILOXANE AND STEAM IN AMOUNT OF AT LEAST 1.6 MOL PERCENT STEAM BASED ON THE SILOXANE AT A TEMPERATURE OF FROM 200* C. TO 400* C. AT A PRESSURE ABOVE ATMOSPHERIC WHEREBY A MIXTURE OF DIMETHYLSILOXANE DIOLS OF THE TYPE.
Claim 2
Independent Claim
57 words
THE METHOD OF PREPARING DIMETHYLPOLYLSILOXANE DIOLS WHICH COMPRISES HEATING A MIXTURE CONSISTING ESSENTIALLY OF A COMPLETELY CONDENSED DIMETHYLPOLYSILOXANE AND STEAM IN AMOUNT OF AT LEAST 1.6 MOL PERCENT STEAM BASED ON THE SILOXANE AT A TEMPERATURE OF FROM 200* C. TO 400* C. AT A PRESSURE ABOVE ATMOSPHERIC WHEREBY A MIXTURE OF DIMETHYLSILOXANE DIOLS OF THE TYPE.
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) | 1955-08-19 | 1956-02-18 | 1956-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-19 | 1960-02-18 | 1960-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-19 | 1964-02-18 | 1964-08-19 | $7700.00 | Window Closed / Lapsed |