Patent US3539270A successfully refreshed from Google Patents.
US3539270A
Expired / Lapsed
US
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Method of and apparatus for lubricating and cooling a rotary shaft seal assembly
Assignee: Elliott Turbomachinery Co Inc
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Filing: 1968-03-14
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Granted: 1970-11-10
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Expires: 1988-03-14
Abstract
No abstract record available.
Inventors
- 👤 George W Derrickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:28
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/12; F04D29/122; F04D29/124; F01; F01D; F01D11/00; F01D11/02; F01D11/04; Y; Y10; Y10S; Y10S277/00; Y10S277/93
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2677328A
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DE919084C
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US2854927A
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US2913989A
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US2928685A
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US3081095A
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US3275330A
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US3235269A
Cited
US3236529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |