US3228384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve stem sealing means with positive stem lubrication
Assignee: Individual
•
Filing: 1964-12-07
•
Granted: 1966-01-11
•
Expires: 1984-12-07
Abstract
No abstract record available.
Inventors
- 👤 William G Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:41
CPC Classifications
F; F01; F01M; F01M9/00; F01M9/10; F01M9/103; F01L; F01L3/00; F01L3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A VALVE STEM SEAL ADAPTED TO BE ATTACHED AXIALLY BY ITS INTERFERENCE FIT TO A VALVE STEM COMPRISING A RIGID MOLDED FLUOROCARBON POLYMER PLASTIC CUP HAVING AN INSIDE CYLINDRICAL SURFACE DISPOSED TO MAKE SLIDING CONTACT WITH A VALVE STEM GUIDE DURING THE OPERATIVE MOVEMENT OF THE VALVE STEM.
Claim 2
Dependent Claim
48 words
A VALVE STEM SEAL ADAPTED TO BE ATTACHED AXIALLY BY ITS INTERFERENCE FIT TO A VALVE STEM COMPRISING A RIGID MOLDED FLUOROCARBON POLYMER PLASTIC CUP HAVING AN INSIDE CYLINDRICAL SURFACE DISPOSED TO MAKE SLIDING CONTACT WITH A VALVE STEM GUIDE DURING THE OPERATIVE MOVEMENT OF THE VALVE STEM.
References Cited (Backward Citations)
GB256615A
Cited
US3110298A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |