US3526685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of foamed gypsum castings
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1967-09-22
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Granted: 1970-09-01
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Expires: 1987-09-22
Abstract
No abstract record available.
Inventors
- 👤 Edward Graham Foster
- 👤 Martin S Bloom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:36
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; B; B28; B28B; B28B1/00; B28B1/14; B28B1/16; B28B1/50; B28B19/00; B28B19/0092; B28B23/00; B28B23/0006; B28B5/00; B28B5/02; B28B5/026; B28B5/027; B28B7/00; B28B7/0064; B28B7/0067; B28B7/36; B28C; B28C5/00; B28C5/003; B29; B29C; B29C44/00; B29C44/20; B29C44/28; C04B28/145; C04B28/146
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-31 | 1974-03-02 | 1974-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-31 | 1978-03-02 | 1978-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-31 | 1982-03-02 | 1982-09-01 | $7700.00 | Window Closed / Lapsed |