US2877499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a molded article
Assignee: Rostone Corp
•
Filing: 1955-10-05
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Granted: 1959-03-17
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Expires: 1975-10-05
Abstract
No abstract record available.
Inventors
- 👤 Robert E Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:48
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/10; C04B28/105
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A PROCESS OF PRODUCING A MOLDED ARTICLE, COMPRISING PRESSURE-MOLDING INTO THE DESIRED SHAPE A MIXTURE COMPRISING WATER AND A SUBSTANCE SELECTED FROM THE CLASS CONSISTING OF MAGNESIUM OXIDE AND MAGNESIUM HYDROXIDE, EXPOSING THE MOLDED ARTICLE TO CARBON DIOXIDE GAS TO CONVERT THE MAGNESIUM COMPOUND INTO A CARBONATE, AND THEN HYDRATING SUCH CARBONATE BY TREATING THE ARTICLE WITH STEAM UNDER PRESSURE.
Claim 2
Dependent Claim
60 words
A PROCESS OF PRODUCING A MOLDED ARTICLE, COMPRISING PRESSURE-MOLDING INTO THE DESIRED SHAPE A MIXTURE COMPRISING WATER AND A SUBSTANCE SELECTED FROM THE CLASS CONSISTING OF MAGNESIUM OXIDE AND MAGNESIUM HYDROXIDE, EXPOSING THE MOLDED ARTICLE TO CARBON DIOXIDE GAS TO CONVERT THE MAGNESIUM COMPOUND INTO A CARBONATE, AND THEN HYDRATING SUCH CARBONATE BY TREATING THE ARTICLE WITH STEAM UNDER PRESSURE.
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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) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |