Patent US2489138A successfully refreshed from Google Patents.
US2489138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of siloxanes
Assignee: Corning Glass Works
•
Filing: 1946-02-21
•
Granted: 1949-11-22
•
Expires: 1966-02-21
Abstract
No abstract record available.
Inventors
- 👤 Hyde James Franklin
- 👤 Daudt William Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:11
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C07F7/0872; C07F7/0874; C08; C08G; C08G77/00; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2258218A
Cited
US2258220A
Cited
US2258222A
Cited
GB552640A
Cited
US2398187A
Cited
US2386441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |