US3421909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siliceous compositions containing azo aromatic compounds as stabilizers
Assignee: EIDP Inc
•
Filing: 1967-12-20
•
Granted: 1969-01-14
•
Expires: 1987-12-20
Abstract
No abstract record available.
Inventors
- 👤 Robert L Rusher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:39
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C04B24/00; C04B24/008; C04B24/12; C04B24/129; C04B24/16; C04B24/18; C04B24/20; C23; C23C; C23C24/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |