US2820000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dentifrice comprising diatomaceous silica
Assignee: Individual
•
Filing: 1953-04-03
•
Granted: 1958-01-14
•
Expires: 1973-04-03
Abstract
No abstract record available.
Inventors
- 👤 Menzies Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:51
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/25; A61Q; A61Q11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A DENTAL CLEANSING COMPOSITION, COMPRISING A MAJOR PORTION OF DIATOMACEOUS SILICA AND A MINOR PORTION OF A DRY POWDERED SOAP, SAID SILICA BEING PURE TO THE EXTENT OF CONTAINING IN EXCESS OF 90% SIO2, SAID SILICA HAVING A PARTICLE SIZE DISTRIBUTION SUCH THAT THE ENTIRE SILICA WILL PASS A 300-MESH SCREEN AND NOT MORE THAN ABOUT 10% THEREOF HAS A PARTICLE SIZE OF UNDER 2 MICRONS, ALL THE INGREDIENTS OF SAID COMPOSITION HAVING A HARDNESS VALUE LESS THAN DENTAL ENAMEL.
Claim 2
Dependent Claim
80 words
A DENTAL CLEANSING COMPOSITION, COMPRISING A MAJOR PORTION OF DIATOMACEOUS SILICA AND A MINOR PORTION OF A DRY POWDERED SOAP, SAID SILICA BEING PURE TO THE EXTENT OF CONTAINING IN EXCESS OF 90% SIO2, SAID SILICA HAVING A PARTICLE SIZE DISTRIBUTION SUCH THAT THE ENTIRE SILICA WILL PASS A 300-MESH SCREEN AND NOT MORE THAN ABOUT 10% THEREOF HAS A PARTICLE SIZE OF UNDER 2 MICRONS, ALL THE INGREDIENTS OF SAID COMPOSITION HAVING A HARDNESS VALUE LESS THAN DENTAL ENAMEL.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |