Patent US3503115A successfully refreshed from Google Patents.
US3503115A
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Helical feeding mechanism for spring assembly machine
Assignee: Leggett and Platt Inc
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Filing: 1967-06-12
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Granted: 1970-03-31
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Expires: 1987-06-12
Abstract
No abstract record available.
Inventors
- 👤 Carl O Kirchner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:24
CPC Classifications
B; B21; B21F; B21F33/00; B21F33/04; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53313; Y10T29/53383; Y10T29/53613
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3392433A
Cited
US3378907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-30 | 1973-09-29 | 1974-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-30 | 1977-09-29 | 1978-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-30 | 1981-09-29 | 1982-03-31 | $7700.00 | Window Closed / Lapsed |