US2738901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spreader
Assignee: Individual
•
Filing: 1953-05-05
•
Granted: 1956-03-20
•
Expires: 1973-05-05
Abstract
No abstract record available.
Inventors
- 👤 Eskil W Swenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:08
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/12; E01C19/20; E01C19/201; E01C19/202
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US589546A
Cited
US616298A
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US1712485A
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US1957594A
Cited
US1966192A
Cited
US2243233A
Cited
US2282625A
Cited
US2323995A
Cited
US2612294A
Cited
US2510231A
Cited
US2624492A
Cited
US2593696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |