US3412426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the preparation of elliptical structures
Assignee: Dow Chemical Co
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Filing: 1966-12-19
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Granted: 1968-11-26
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Expires: 1986-12-19
Abstract
No abstract record available.
Inventors
- 👤 Jr William W O'dell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:00
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/20; B29C69/00; E; E04; E04B; E04B1/00; E04B1/32; E04G; E04G11/00; E04G11/04; E04G11/06; E04G11/20; E04B2001/3217; E04B2001/3258; E04B2001/3264
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) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |