US3540884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacture of cellular refractory or metallic materials
Assignee: Rolls Royce PLC
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Filing: 1968-06-10
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Granted: 1970-11-17
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Expires: 1988-06-10
Abstract
No abstract record available.
Inventors
- 👤 Eric A Horbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:13
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/08; B; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F3/1121; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/48; C04B35/50; C04B35/515; C04B35/58; C04B35/584; C04B35/591; C04B38/00; C04B38/06; B22F2998/00
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) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |