Patent US3297735A successfully refreshed from Google Patents.
US3297735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of ethers of hydroxymethyl polymethyl siloxanes
Assignee: Bayer AG
•
Filing: 1964-03-12
•
Granted: 1967-01-10
•
Expires: 1984-03-12
Abstract
No abstract record available.
Inventors
- 👤 Simmler Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:08
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/38; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C07F7/0872; C07F7/0889
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A PROCESS FOR PREPARING AN ETHER OF A HYDROXYMENTYL POLYMETHYL SILOXANE WHICH COMPIRSES REACTING TOGETHER ANALIPHATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONOHYDRIC ALCOHOLS, POLYHYDRIC ALCOHOLS, ETHER ALCOHOLS, ESTER ALCOHOLS AND ESTERS OF ALIPHATIC HYDROXYCARBOXYLIC ACIDS WITH A BROMINE-SUBSTITUTED METHYL POLYSILOXANE OF THE FORMULA
Claim 2
Dependent Claim
45 words
A PROCESS FOR PREPARING AN ETHER OF A HYDROXYMENTYL POLYMETHYL SILOXANE WHICH COMPIRSES REACTING TOGETHER ANALIPHATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONOHYDRIC ALCOHOLS, POLYHYDRIC ALCOHOLS, ETHER ALCOHOLS, ESTER ALCOHOLS AND ESTERS OF ALIPHATIC HYDROXYCARBOXYLIC ACIDS WITH A BROMINE-SUBSTITUTED METHYL POLYSILOXANE OF THE FORMULA
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) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |