US3297535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shellac tablet coating compositions and methods of preparation
Assignee: F Hoffmann La Roche AG
•
Filing: 1963-02-28
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Granted: 1967-01-10
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Expires: 1983-02-28
Abstract
No abstract record available.
Inventors
- 👤 Butler John Allen
- 👤 Valentine William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:52
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/282; C; C08; C08L; C08L93/00; C08L93/02; C09; C09D; C09D193/00; C09D193/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A COMPOSITION COMPRISING A HOMOGENEOUS MIXTURE OF FROM ABOUT 5.0% TO ABOUT 40.0% BY WEIGHT OF SHELLAC, FROM ABOUT 0.1% TO ABOUT 2.0% BY WEIGHT OF A WETTING AGENT, FROM ABOUT 2.0% TO ABOUT 50.0% BY WEIGHT OF AN OPACIFYING AGENT, FROM ABOUT 0.5% TO ABOUT 5.0% BY WEIGHT OF PLASTICIZING AGENT, AND FROM ABOUT 35.0% TO ABOUT 70.0% BY WEIGHT OF AN INERT ORGANIC SOLVENT IN WHICH BOTH THE SAID SHELLAC AND SAID PLASTICIZING AGENT ARE SOLUBLE.
Claim 2
Dependent Claim
78 words
A COMPOSITION COMPRISING A HOMOGENEOUS MIXTURE OF FROM ABOUT 5.0% TO ABOUT 40.0% BY WEIGHT OF SHELLAC, FROM ABOUT 0.1% TO ABOUT 2.0% BY WEIGHT OF A WETTING AGENT, FROM ABOUT 2.0% TO ABOUT 50.0% BY WEIGHT OF AN OPACIFYING AGENT, FROM ABOUT 0.5% TO ABOUT 5.0% BY WEIGHT OF PLASTICIZING AGENT, AND FROM ABOUT 35.0% TO ABOUT 70.0% BY WEIGHT OF AN INERT ORGANIC SOLVENT IN WHICH BOTH THE SAID SHELLAC AND SAID PLASTICIZING AGENT ARE SOLUBLE.
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) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |