US3420913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activated charcoal in rubber compounding
Assignee: Phillips Petroleum Co
•
Filing: 1967-02-07
•
Granted: 1969-01-07
•
Expires: 1987-02-07
Abstract
No abstract record available.
Inventors
- 👤 Henry E Railsback
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:01
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495
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) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |