Patent US4121940A successfully refreshed from Google Patents.
US4121940A
Expired / Lapsed
US
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Endodontic formula for treatment of root canal
Assignee: Individual
•
Filing: 1977-02-24
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Granted: 1978-10-24
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Expires: 1997-02-24
Abstract
Abstract An endodontic formula for continuous medication of root canals is provided comprising zinc oxide, titanium oxide, paraformaldehyde, vitreous carbon, hydrocortisone, and prednisolone, all of which may be mixed with a eugenol liquid for filling the root canal. Alternatively, the hydrocortisone and prednisolone may be omitted and the amount of zinc oxide may be used to take its place.
Inventors
- 👤 George H. Michel
- 👤 Donald J. Sabol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:42
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/60; A61K6/69; A61K6/50; A61K6/54; A61K6/80; A61K6/884; A61K6/887; A61K6/889; A61P; A61P1/00; A61P1/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
49 words
A formula for endodontic treatment of a root canal comprising a mixture by weight of: 0.5% to 30% of titanium oxide, 0.05% to 84.00% of zinc oxide, 0% to 8% of hydrocortisone, 0% to 8% of prednisolone, 5% to 25% of paraformaldehyde, and 0.2% to 30% of vitreous carbon.
Claim 2
Dependent Claim
49 words
A formula for endodontic treatment of a root canal comprising a mixture by weight of: 0.5% to 30% of titanium oxide, 0.05% to 84.00% of zinc oxide, 0% to 8% of hydrocortisone, 0% to 8% of prednisolone, 5% to 25% of paraformaldehyde, and 0.2% to 30% of vitreous carbon.
Claim 3
Dependent Claim
31 words
A formula for endodontic treatment of a root canal comprising a mixture by weight of: paraformaldehyde, 6.5%; vitreous carbon, 5%; titanium oxide, 4%; zinc oxide, 83.09%; hydrocortisone, 1.2%; and prednisolone, 0.21%.
Claim 4
Dependent Claim
31 words
A formula for endodontic treatment of a root canal comprising a mixture by weight of: paraformaldehyde, 6.5%; vitreous carbon, 5%; titanium oxide, 4%; zinc oxide, 83.09%; hydrocortisone, 1.2%; and prednisolone, 0.21%.
Claim 5
Dependent Claim
27 words
A formula for endodonctic treatment of a root canal comprising a mixture by weight of: paraformaldehyde, 6.5%; vitreous carbon, 5%; titanium oxide, 4%; and zinc oxide 84.5%.
Claim 6
Dependent Claim
27 words
A formula for endodonctic treatment of a root canal comprising a mixture by weight of: paraformaldehyde, 6.5%; vitreous carbon, 5%; titanium oxide, 4%; and zinc oxide 84.5%.
Claim 7
Dependent Claim
59 words
In a formula for a treatment of a root canal which consists basically of zinc oxide, paraformaldehyde, and metal salts of tatanium oxide, bismuth oxide, bismuth subcarbonate, barium sulphate, lead oxide, bismuth phosphate and phenyl mercuric borate, the improvement comprising: replacing the bismuth oxide, bismuth subcarbonate, barium sulphate, lead oxide, bismuth phosphate and phenyl mercuric borate with vitreous carbon.
Claim 8
Dependent Claim
59 words
In a formula for a treatment of a root canal which consists basically of zinc oxide, paraformaldehyde, and metal salts of tatanium oxide, bismuth oxide, bismuth subcarbonate, barium sulphate, lead oxide, bismuth phosphate and phenyl mercuric borate, the improvement comprising: replacing the bismuth oxide, bismuth subcarbonate, barium sulphate, lead oxide, bismuth phosphate and phenyl mercuric borate with vitreous carbon.
References Cited (Backward Citations)
US2516438A
Cited
US3205132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |