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US16972A
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US
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Forming spiral springs for chairs
Assignee: —
•
Filing: —
•
Granted: 1857-04-07
•
Expires: 1874-04-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:06
CPC Classifications
A; A47; A47C; A47C23/00; A47C23/04; A47C23/043; A47C23/0438; Y; Y10; Y10S; Y10S2/00; Y10S2/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1860-04-06 | 1860-10-06 | 1861-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1864-04-06 | 1864-10-06 | 1865-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1868-04-06 | 1868-10-06 | 1869-04-07 | $7700.00 | Window Closed / Lapsed |