US3473987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making thin-walled refractory structures
Assignee: EIDP Inc
•
Filing: 1965-07-13
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Granted: 1969-10-21
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Expires: 1985-07-13
Abstract
No abstract record available.
Inventors
- 👤 Donald Maurice Sowards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:33
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/65; C04B35/01; C04B35/16; C04B35/18; Y; Y10; Y10S; Y10S264/00; Y10S264/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
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) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |