US3789462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive-filled dental prophylactic cup
Assignee: 3M Co
•
Filing: 1973-03-26
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Granted: 1974-02-05
•
Expires: 1993-03-26
Abstract
Abstract An abrasive-filled, paste-free dental prophylactic cup is formed from a urethane elastomer. The elastomer consists essentially of tolylene diisocyanate endcapped polytetrahydrofuran cured with 4,4''-methylene bis(o-chloroaniline). The elastomer has 25 - 50 percent by weight of pumice added to the elastomer as a dental abrasive. Prophylactic cups formed from the abrasive filled elastomer will perform a suitable dental prophylaxis without the addition of prophylactic paste.
Inventors
- 👤 C Reich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:59
CPC Classifications
A; A61; A61C; A61C17/00; A61C17/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
The abrasive-filled prophylactic cup of claim 1, containing a complex organic phosphoric acid as a plasticizer.
Claim 2
Dependent Claim
17 words
The abrasive-filled prophylactic cup of claim 1, containing from 0.05 to 2.0 parts of a coloring pigment.
References Cited (Backward Citations)
US3241239A
Cited
US3599333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |