US3372940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Face seal
Assignee: Dresser Industries Inc
•
Filing: 1965-07-15
•
Granted: 1968-03-12
•
Expires: 1985-07-15
Abstract
No abstract record available.
Inventors
- 👤 Edwin G Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:25
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3436; F16J15/344; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/944
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR728452A
Cited
US1918685A
Cited
DE1114104B
Cited
US3195900A
Cited
FR1326010A
Cited
US3244457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |