US3369915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gypsum product and method of making same
Assignee: Dow Chemical Co
•
Filing: 1964-10-01
•
Granted: 1968-02-20
•
Expires: 1984-10-01
Abstract
No abstract record available.
Inventors
- 👤 John M Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:24
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/16; C04B24/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2318540A
Cited
US2552775A
Cited
US2854477A
Cited
US2921862A
Cited
US2913346A
Cited
US3232777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |