US2684844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sinuous type of spring with variable lengths of transverse and longitudinal bars
Assignee: American Metal Products Co
•
Filing: 1952-05-31
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Granted: 1954-07-27
•
Expires: 1972-05-31
Abstract
No abstract record available.
Inventors
- 👤 Hyland C Flint
- 👤 Richard J Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:02
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/02; A47C7/28; A47C7/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR999441A
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DE443487C
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US2002399A
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US2248093A
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US2257367A
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US2341015A
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US2407933A
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US2578958A
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US2566250A
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US2526184A
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US2639763A
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US2646108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |