US3539270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for lubricating and cooling a rotary shaft seal assembly
Assignee: Elliott Turbomachinery Co Inc
•
Filing: 1968-03-14
•
Granted: 1970-11-10
•
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 10:08
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
NL285078A
Cited
US2555492A
Cited
US2677328A
Cited
DE919084C
Cited
US2854927A
Cited
US2913989A
Cited
US2928685A
Cited
US3081095A
Cited
US3275330A
Cited
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 |