Patent US4419818A successfully refreshed from Google Patents.
Patent US3438720A successfully refreshed from Google Patents.
US3438720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxides
Assignee: British Titan Products Co Ltd
•
Filing: 1966-01-11
•
Granted: 1969-04-15
•
Expires: 1986-01-11
Abstract
No abstract record available.
Inventors
- 👤 Denis Cleaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:56
CPC Classifications
B; B01; B01J; B01J12/00; B01J12/002; B01J12/007; B01J19/00; B01J19/08; B01J19/12; B01J4/00; B01J4/04; C; C01; C01B; C01B13/00; C01B13/14; C01B13/20; C01B13/22; C01B13/28; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B33/183; C01F; C01F7/00; C01F7/02; C01F7/30; C01F7/302; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07; C01G25/00; C01G25/02; C23; C23F; C23F15/00; C23F15/005; B01J2219/00; B01J2219/08; B01J2219/0894
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2670275A
Cited
US2750260A
Cited
US2945797A
Cited
US3257196A
Cited
DE1183482B
Cited
US3203763A
Cited
US3275411A
Cited
US3337438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |