Patent US3251701A successfully refreshed from Google Patents.
Patent US2828187A successfully refreshed from Google Patents.
US2828187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of titanium dioxide
Assignee: British Titan Products Co Ltd
•
Filing: 1954-08-03
•
Granted: 1958-03-25
•
Expires: 1974-08-03
Abstract
No abstract record available.
Inventors
- 👤 Evans Arthur Wallace
- 👤 Hughes William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:05
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A METHOD OF PREPARING TITANIUM DIOXIDE WHICH COMPRISES ESTABLISHING A FLUIDIZED BED COMPRISING INERT PARTICLES HAVING A PARTICLE SIZE OF APPROXIMATELY 40 MICRONS TO 1000 MICRONS, INTRODUCING TITANIUM TETRACHLORIDE AND OXYGEN INTO THE BED AND MAINTAINING THE TEMPERATURE OF THE BED SUFFICIENTLY HIGH TO CAUSE THE TITANIUM TETRACHLORIDE AND OXYGEN TO REACT TO PRODUCE TITANIUM DIOXIDE AND CARRYING EVOLVED TITANIUM DIOXIDE FROM THE BED WITH THE GASES LEAVING SAID BED.
Claim 2
Independent Claim
70 words
A METHOD OF PREPARING TITANIUM DIOXIDE WHICH COMPRISES ESTABLISHING A FLUIDIZED BED COMPRISING INERT PARTICLES HAVING A PARTICLE SIZE OF APPROXIMATELY 40 MICRONS TO 1000 MICRONS, INTRODUCING TITANIUM TETRACHLORIDE AND OXYGEN INTO THE BED AND MAINTAINING THE TEMPERATURE OF THE BED SUFFICIENTLY HIGH TO CAUSE THE TITANIUM TETRACHLORIDE AND OXYGEN TO REACT TO PRODUCE TITANIUM DIOXIDE AND CARRYING EVOLVED TITANIUM DIOXIDE FROM THE BED WITH THE GASES LEAVING SAID BED.
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) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |