US3304189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic plaster set retarder
Assignee: Canadian Patents and Development Ltd
•
Filing: 1965-10-18
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Granted: 1967-02-14
•
Expires: 1985-10-18
Abstract
No abstract record available.
Inventors
- 👤 Richard A Kuntze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:44
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
AN IMPROVED PLASTER COMPOSITION COMPRISING CALCINED GYPSUM PLASTER AND AS A PLASTER SET RETARDER FROM ABOUT 0.025 TO ABOUT 0.5% BASED ON THE WEIGHT OF THE PLASTER IN THE MIX, OF A WATER-SOLUBLE COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC POLYAMINO POLYCARBOXYLIC ACIDS OF THE GENERAL FORMULA
Claim 2
Dependent Claim
48 words
AN IMPROVED PLASTER COMPOSITION COMPRISING CALCINED GYPSUM PLASTER AND AS A PLASTER SET RETARDER FROM ABOUT 0.025 TO ABOUT 0.5% BASED ON THE WEIGHT OF THE PLASTER IN THE MIX, OF A WATER-SOLUBLE COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC POLYAMINO POLYCARBOXYLIC ACIDS OF THE GENERAL FORMULA
References Cited (Backward Citations)
US2499445A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |