US2941890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental stone or plaster
Assignee: ZANDBERG
•
Filing: 1958-07-01
•
Granted: 1960-06-21
•
Expires: 1978-07-01
Abstract
No abstract record available.
Inventors
- 👤 Paul I Zandberg
- 👤 Diamond Harry Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:17
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A DENTAL STONE COMPOSITION CONSISTING ESSENTIALLY OF, A HOMOGENEOUS MASS OF 0.37% BY WEIGHT OF ALUMINUM POWDER, 99.29% BY WEIGHT OF ALPHA GYPSUM POWDER, AND 0.34% BY WEIGHT OF A NETURAL SODIUM SALT OF A CONDENSED ARYL SLUPHONIC ACID POWDER.
Claim 2
Dependent Claim
40 words
A DENTAL STONE COMPOSITION CONSISTING ESSENTIALLY OF, A HOMOGENEOUS MASS OF 0.37% BY WEIGHT OF ALUMINUM POWDER, 99.29% BY WEIGHT OF ALPHA GYPSUM POWDER, AND 0.34% BY WEIGHT OF A NETURAL SODIUM SALT OF A CONDENSED ARYL SLUPHONIC ACID POWDER.
References Cited (Backward Citations)
US1357375A
Cited
US1863591A
Cited
US2241604A
Cited
US2605191A
Cited
US2754220A
Cited
US2887392A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |