Patent US542470A successfully refreshed from Google Patents.
Patent US4931286A successfully refreshed from Google Patents.
US4931286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High gloss cellulose tablet coating
Assignee: Aqualon Co
•
Filing: 1989-04-19
•
Granted: 1990-06-05
•
Expires: 2009-04-19
Abstract
Abstract High gloss pharmaceutical tablets have an outer coating of sodium carboxymethylcellulose and polyethylene glycol as 0.1 to 5.0% by weight of the tablet. The sodium carboxymethylcellulose has a D.S. between 0.2 and 1.4 and a D.P. between 100 and 4000. Spraying the coating from a water solution eliminates the need for solvent recovery.
Inventors
- 👤 Joseph L. Johnson
- 👤 George W. Skinner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:32
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/286; A61K9/2866
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
64 words
A high gloss pharmaceutical tablet comprising of at least one active ingredient in a binder matrix as a core with an outermost coating of sodium carboxymethylcellulose having a degree of substitution (D.S.) between 0.2 and 1.4 and a degree of polymerization (D.P.) between 100 and 400 and a polyethylene glycol plasticizer wherein the outermost coating is applied from a water solution by spray coating.
Claim 2
Dependent Claim
64 words
A high gloss pharmaceutical tablet comprising of at least one active ingredient in a binder matrix as a core with an outermost coating of sodium carboxymethylcellulose having a degree of substitution (D.S.) between 0.2 and 1.4 and a degree of polymerization (D.P.) between 100 and 400 and a polyethylene glycol plasticizer wherein the outermost coating is applied from a water solution by spray coating.
Claim 3
Dependent Claim
12 words
The tablet of claim 1 where the active ingredient is a medicant.
Claim 4
Dependent Claim
22 words
The tablet of claim 2 where the outermost coating comprises 0.5 to 5.0% by weight of the total weight of the tablet.
Claim 5
Dependent Claim
17 words
The tablet of claim 3 where the polyethylene glycol plasticizer has a molecular weight of about 400.
Claim 6
Dependent Claim
23 words
The tablet of claim 4 where the sodium carboxymethylcellulose has a D.S. between 0.5 and 0.9 and a D.P between 200 and 1000.
Claim 7
Dependent Claim
11 words
The tablet of claim 5 where the coating contains a colorant.
Claim 8
Independent Claim
74 words
A method for preparing high gloss pharmaceutical tablets comprises the steps: (1) preparing an aqueous solution of sodium carboxymethylcellulose having a degree of substitution (D.S.) between 0.2 and 1.4 and a degree of polymerization (D.P.) between 100 and 400 and a polyethylene glycol plasticizer; and (2) applying the solution to pharmaceutical tablets by spray coating to provide a weight gain of from 0.5 to 5.0% based on the total weight of the pharmaceutical tablet.
Claim 9
Independent Claim
74 words
A method for preparing high gloss pharmaceutical tablets comprises the steps: (1) preparing an aqueous solution of sodium carboxymethylcellulose having a degree of substitution (D.S.) between 0.2 and 1.4 and a degree of polymerization (D.P.) between 100 and 400 and a polyethylene glycol plasticizer; and (2) applying the solution to pharmaceutical tablets by spray coating to provide a weight gain of from 0.5 to 5.0% based on the total weight of the pharmaceutical tablet.
Claim 10
Dependent Claim
18 words
The method of claim 7 where the plasticizer is polyethylene glycol with a molecular weight of about 400.
Claim 11
Dependent Claim
23 words
The method of claim 8 where the sodium carboxymethylcellulose has a D.S. between 0.5 and 0.9 and a D.P. between 200 and 1000.
Claim 12
Dependent Claim
13 words
The method of claim 9 where the weight gain is 1.0 to 2.0%.
References Cited (Backward Citations)
US4330338A
Cited
US4543370A
Cited
US4302440A
Cited
US4302440B1
Cited
US4683256A
Cited
CA1217140A
Cited
US4513019A
Cited
US4802924A
Cited
EP0253541A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |