Patent US2989298A successfully refreshed from Google Patents.
US2989298A
Expired / Lapsed
US
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Elastic suspension device
Assignee: Individual
•
Filing: 1956-09-24
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Granted: 1961-06-20
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Expires: 1976-09-24
Abstract
No abstract record available.
Inventors
- 👤 Ljungstrom Erik Gunnar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:30
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/16; G01V1/18; G01P; G01P15/00; G01P15/02; G01P15/03; G01P15/032
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US392617A
Cited
US2753176A
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US1173850A
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US1602966A
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US2614508A
Cited
US2649294A
Cited
US2675525A
Cited
US2757050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |