Stabilized shellac sealing coating for tablets
Abstract
Abstract A STABILIZED SHELLAC SEALING COATING FOR TABLETS AND THE LIKE COMPRISING SHELLAC AND POLYVINYLPYRROLIDONE, SAID SHELLAC HAVING FREE CARBOXYL GROUPS, SAID POLYVINYLPYRROLIDONE HAVING FREE BASIC GROUPS, THE RATIO BY WEIGHT OF THE SHALLAC FREE CARBOXYL GROUPS TO THE POLYVINYLPYRROLIDONE FREE BASIC GROUPS BEING ABOUT 1 TO 1. A METHOD OF MAKING A STABILIZED SHELLAC SEALING FILM FOR COATING TABLETS AND THE LIKE COMPRISING TAKING A DESIRED QUANTITY OF SHELLAC, TITRATING A SPECIMEN OF THE SHELLAC TO ASCERTAIN THE NUMBER OF MOLES OF ACID IN THE SHELLAC, ADDING TO THE SHELLAC A QUANTITY OF POLYVINYLPYRROLIDONE HAVING THE SAME NUMBER OF MOLES OF BASE, AND MIXING THE SHELLAC AND POLYVINYLPYRROLIDONE TOGETHER IN A SOLVENT.
Inventors
- 👤 C Signorino
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |