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Patent US3491948A successfully refreshed from Google Patents.
US3491948A
Expired / Lapsed
US
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High pressure hydraulic apparatus
Assignee: RALPH D ALEXANDER
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Filing: 1968-04-08
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Granted: 1970-01-27
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Expires: 1988-04-08
Abstract
No abstract record available.
Inventors
- 👤 Ralph D Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:28
CPC Classifications
B; B60; B60S; B60S3/00; B60S3/04; B60S3/044; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87571; Y10T137/87587; Y10T137/87643
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3140049A
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US3118610A
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US3246845A
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US3380658A
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US3369705A
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US3433417A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |