US3445323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of plasterboard from synthetic gypsum
Assignee: Individual
•
Filing: 1966-01-19
•
Granted: 1969-05-20
•
Expires: 1986-01-19
Abstract
No abstract record available.
Inventors
- 👤 Adolph Schnabel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:12
CPC Classifications
C; C04; C04B; C04B11/00; C04B11/26; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/258; Y10T428/31504; Y10T428/31971; Y10T428/31993; Y10T428/31996
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1900381A
Cited
GB514942A
Cited
US2655430A
Cited
US2606127A
Cited
US2937926A
Cited
US3047447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |