US2921950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing copolymeric organopolysiloxanes
Assignee: Union Carbide Corp
•
Filing: 1957-08-15
•
Granted: 1960-01-19
•
Expires: 1977-08-15
Abstract
No abstract record available.
Inventors
- 👤 Victor B Jex
- 👤 Donald L Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:32
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A PROCESS FOR PREPARING COPOLYMERIC SILOXANES COMPOSED OF UNITS HAVING THE FORMULA:
Claim 2
Dependent Claim
12 words
A PROCESS FOR PREPARING COPOLYMERIC SILOXANES COMPOSED OF UNITS HAVING THE FORMULA:
References Cited (Backward Citations)
BE533700A
Cited
US2738357A
Cited
US2754311A
Cited
FR1117543A
Cited
US2762823A
Cited
GB769498A
Cited
US2832754A
Cited
US2815300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |