Patent US2951791A successfully refreshed from Google Patents.
US2951791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of calcium silicate in tablet compressing
Assignee: Wyeth Holdings LLC
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Filing: 1959-08-31
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Granted: 1960-09-06
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Expires: 1979-08-31
Abstract
No abstract record available.
Inventors
- 👤 Stearns Carl Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:58
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2009
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
THE PROCESS OF PREPARING TABLETS OF THERAPEUTIC MATERIALS COMPRISING THE STEPS OF MIXING A NON-GRANULATED ACTIVE THERAPEUTIC MATERIAL WITH NOT LESS THAN ABOUT 20% BY WEIGHT OF CALCIUM SILICATE AEROGEL HAVING A PARTICLE SIZE OF FROM ABOUT 0.01 MICRON TO ABOUT 0.05 MICRON, AND FORMING THE MIXTURE THUS OBTAINED INTO TABLETS BY COMPRESSION.
Claim 2
Dependent Claim
53 words
THE PROCESS OF PREPARING TABLETS OF THERAPEUTIC MATERIALS COMPRISING THE STEPS OF MIXING A NON-GRANULATED ACTIVE THERAPEUTIC MATERIAL WITH NOT LESS THAN ABOUT 20% BY WEIGHT OF CALCIUM SILICATE AEROGEL HAVING A PARTICLE SIZE OF FROM ABOUT 0.01 MICRON TO ABOUT 0.05 MICRON, AND FORMING THE MIXTURE THUS OBTAINED INTO TABLETS BY COMPRESSION.
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) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |