Patent US3305725A successfully refreshed from Google Patents.
Patent US2876168A successfully refreshed from Google Patents.
US2876168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calcium pyrophosphate abrasive and dentifrice containing the same
Assignee: Procter and Gamble Co
•
Filing: 1956-08-20
•
Granted: 1959-03-03
•
Expires: 1976-08-20
Abstract
No abstract record available.
Inventors
- 👤 Robert W Broge
- 👤 Robert J Grabenstetter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:35
CPC Classifications
A; A61; A61Q; A61Q11/00; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
A DENTIFRICE COMPRISING A SUDSING AGENT AND AN ABRASIVE, SAID ABRASIVE COMPRISING A CALCUIM PYROPHOSPHATE FORMED BY HEATING DICALCIUM ORTHOPHOSPHATE DIHYDRATE TO A TEMPERATURE WITHIN THE RANGE FROM 500* TO 700* C., THE SAID HEATING BEING CARRIED OUT AT AN AVERAGE RATE OF NOT LESS THAN 50* C. PER MINUTE AND, IN THE TEMPERATURE RANGE OF FROM 100* T0 300* C., AT A RATE OF NOT LESS THAN 60* C. PER MINUTE, AND MAINTAINING THE RESULTING PRODUCT AT A TEMPERATURE WITHIN THE RANGE FROM 500 C. TO 700* C. UNTIL AT LEAST 10% BUT NOT MORE THAN 50%
References Cited (Backward Citations)
US2191199A
Cited
US2697024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |