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US3450808A
Expired / Lapsed
US
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Method of preparing a synthetic stone material
Assignee: ALBERT L ROBERTS
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Filing: 1966-08-24
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Granted: 1969-06-17
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Expires: 1986-08-24
Abstract
No abstract record available.
Inventors
- 👤 Albert L Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:24
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3189568A
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US3193519A
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US3108985A
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US3328339A
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US3278662A
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US3328231A
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US3328231B1
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US3366720A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |