US2892239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved method of erecting shellform concrete structures
Assignee: Individual
•
Filing: 1952-06-19
•
Granted: 1959-06-30
•
Expires: 1972-06-19
Abstract
No abstract record available.
Inventors
- 👤 Neff Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:34
CPC Classifications
E; E04; E04G; E04G11/00; E04G11/04; E04G11/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2585446A
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US2460662A
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US2612675A
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US2616148A
Cited
US2579801A
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US2705360A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-29 | 1962-12-29 | 1963-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-29 | 1966-12-29 | 1967-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-29 | 1970-12-29 | 1971-06-30 | $7700.00 | Window Closed / Lapsed |