Patent US3972227A successfully refreshed from Google Patents.
Patent US3208972A successfully refreshed from Google Patents.
US3208972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making finely divided monomethylsiloxane
Assignee: Dow Silicones Corp
•
Filing: 1962-09-20
•
Granted: 1965-09-28
•
Expires: 1982-09-20
Abstract
No abstract record available.
Inventors
- 👤 James D Lyons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:59
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A METHOD FOR MAKING A SILOXANE CONSISTING ESSENTIALLY OF THE UNIT FORMULA CH2SIO3.2 HAVING A BULK DENSITY OF LESS THAN ABOUT 0.6 G. PER MILLILITER WHICH COMPRISES ADDING TO WATER, WITH AGITATION, A SILANE SELECTED FROM THE GROUP CONSISTING OF METHYLTRIMETHOXYSILANE AND METHYLTRIETHOXYSILANE, SAID WATER CONTAINING A WATER SOLUBLE ALKALINE SUBSTANCE HAVING A BASIC DISSOCIATION CONSTANT KB WHICH IS AT LEAST 1.8 X 10**5 AT 25*C. IN AN AMOUNT SUFFICIENT TO GIVE THE WATER A PH ABOVE 7, THERE BEING EMPLOYED AT LEAST 6 MOLS OF WATER PER MOL OF SILANE.
Claim 2
Independent Claim
91 words
A METHOD FOR MAKING A SILOXANE CONSISTING ESSENTIALLY OF THE UNIT FORMULA CH2SIO3.2 HAVING A BULK DENSITY OF LESS THAN ABOUT 0.6 G. PER MILLILITER WHICH COMPRISES ADDING TO WATER, WITH AGITATION, A SILANE SELECTED FROM THE GROUP CONSISTING OF METHYLTRIMETHOXYSILANE AND METHYLTRIETHOXYSILANE, SAID WATER CONTAINING A WATER SOLUBLE ALKALINE SUBSTANCE HAVING A BASIC DISSOCIATION CONSTANT KB WHICH IS AT LEAST 1.8 X 10**5 AT 25*C. IN AN AMOUNT SUFFICIENT TO GIVE THE WATER A PH ABOVE 7, THERE BEING EMPLOYED AT LEAST 6 MOLS OF WATER PER MOL OF SILANE.
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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |