Patent US2959187A successfully refreshed from Google Patents.
US2959187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ball-type surface safety valve
Assignee: Otis Engineering Corp
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Filing: 1958-08-18
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Granted: 1960-11-08
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Expires: 1978-08-18
Abstract
No abstract record available.
Inventors
- 👤 William G Boyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:54
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; E; E21; E21B; E21B34/00; E21B34/02; E21B2200/00; E21B2200/04; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-08 | 1964-05-09 | 1964-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-08 | 1968-05-09 | 1968-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-08 | 1972-05-09 | 1972-11-08 | $7700.00 | Window Closed / Lapsed |