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US3494578A
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Centroidally supported modular tetrahedron structure
Assignee: WILLIAM L CURETON
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Filing: 1968-01-24
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Granted: 1970-02-10
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Expires: 1988-01-24
Abstract
No abstract record available.
Inventors
- 👤 William L Cureton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:25
CPC Classifications
A; A63; A63H; A63H27/00; A63H27/08; Y; Y10; Y10S; Y10S52/00; Y10S52/10
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) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |