US2936504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a concrete shelter
Assignee: STORMASTER TORNADO SHELTER CO
•
Filing: 1955-10-03
•
Granted: 1960-05-17
•
Expires: 1975-10-03
Abstract
No abstract record available.
Inventors
- 👤 Harris Francis Le Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:10
CPC Classifications
E; E04; E04H; E04H9/00; E04H9/04; E04H9/10; Y; Y10; Y10S; Y10S249/00; Y10S249/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US578891A
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US1867837A
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US2159690A
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US2068302A
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US2524981A
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US2539741A
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US2556594A
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US2653468A
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US2729966A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |