US1452128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring-coiling machine
Assignee: Sleeper and Hartley Inc
•
Filing: 1921-03-18
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Granted: 1923-04-17
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Expires: 1941-03-18
Abstract
No abstract record available.
Inventors
- 👤 Frank H Sleeper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:28
CPC Classifications
B; B21; B21F; B21F3/00; B21F3/02; B21F3/04; B21F11/00; B21F23/00
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) | 1926-04-16 | 1926-10-16 | 1927-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-04-16 | 1930-10-16 | 1931-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-04-16 | 1934-10-16 | 1935-04-17 | $7700.00 | Window Closed / Lapsed |