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US2465333A
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US
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Spring assembly
Assignee: SPRING UNIT DEV CO
•
Filing: 1945-01-11
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Granted: 1949-03-22
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Expires: 1965-01-11
Abstract
No abstract record available.
Inventors
- 👤 David I Levine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:03
CPC Classifications
A; A47; A47C; A47C23/00; A47C23/04; A47C23/05; A47C23/0515
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US562385A
Cited
US1395421A
Cited
US1742917A
Cited
US1948754A
Cited
US2050105A
Cited
US2116796A
Cited
GB494245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-03-21 | 1952-09-20 | 1953-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-03-21 | 1956-09-20 | 1957-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-03-21 | 1960-09-20 | 1961-03-22 | $7700.00 | Window Closed / Lapsed |