US2681085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for changing the configuration of the end convolutions of spring coils for cushions, mattresses, and the like
Assignee: SPRING UNIT DEV CO
•
Filing: 1949-07-13
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Granted: 1954-06-15
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Expires: 1969-07-13
Abstract
No abstract record available.
Inventors
- 👤 David I Levine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:32
CPC Classifications
B; B21; B21F; B21F33/00; B21F33/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US566379A
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US1326031A
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US1192655A
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US1192631A
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US1821894A
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US1851540A
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US1867128A
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US1860582A
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US2059117A
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US2351659A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |