US3452995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axially narrow metal face seals
Assignee: Caterpillar Inc
•
Filing: 1967-09-21
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Granted: 1969-07-01
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Expires: 1987-09-21
Abstract
No abstract record available.
Inventors
- 👤 Frederick S Engelking
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:00
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3436; F16J15/344; F16C; F16C33/00; F16C33/72; F16C33/76; Y; Y10; Y10S; Y10S277/00; Y10S277/91
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) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |