Patent US3477466A successfully refreshed from Google Patents.
US3477466A
Expired / Lapsed
US
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Elevator fluid control valve mechanism
Assignee: LEWIS D STURM
•
Filing: 1967-04-03
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Granted: 1969-11-11
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Expires: 1987-04-03
Abstract
No abstract record available.
Inventors
- 👤 Lewis D Sturm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:45
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/38; F16K31/383; F16K11/00; F16K11/10; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87265; Y10T137/87499; Y10T137/87507; Y10T137/87555; Y10T137/87563
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2735644A
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US2130611A
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US2197320A
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US2212486A
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US2445887A
Cited
US2409517A
Cited
DE881594C
Cited
US2784738A
Cited
US3216444A
Cited
US3351316A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |