US3414462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gypsum articles resistant to erosion by water and a method for their production
Assignee: BPB Ltd
•
Filing: 1964-05-25
•
Granted: 1968-12-03
•
Expires: 1984-05-25
Abstract
No abstract record available.
Inventors
- 👤 Cafferata Gerald Waterworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:25
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B28/145; C04B28/146; C04B2111/00; C04B2111/00474; C04B2111/00612; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-03 | 1972-06-03 | 1972-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-03 | 1976-06-03 | 1976-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-03 | 1980-06-03 | 1980-12-03 | $7700.00 | Window Closed / Lapsed |