Patent US2750079A successfully refreshed from Google Patents.
US2750079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drop tube structure
Assignee: Individual
•
Filing: 1955-05-10
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Granted: 1956-06-12
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Expires: 1975-05-10
Abstract
No abstract record available.
Inventors
- 👤 Ernest F Trombley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:58
CPC Classifications
B; B67; B67D; B67D7/00; B67D7/005; F; F16; F16K; F16K23/00; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4245; Y10T137/4273; Y10T137/7722; Y10T137/7837; Y10T137/7876
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1892344A
Cited
US1996461A
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US1955029A
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US2133295A
Cited
US2138125A
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US2258636A
Cited
US2295486A
Cited
US2288954A
Cited
FR1089860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |