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US3451698A
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Coupling having concentric spherical surfaces sealed by line contact
Assignee: RICHARD O CHAKROFF
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Filing: 1966-07-20
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Granted: 1969-06-24
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Expires: 1986-07-20
Abstract
No abstract record available.
Inventors
- 👤 Richard O Chakroff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:07
CPC Classifications
F; F16; F16L; F16L27/00; F16L27/02; F16L27/026; F16L19/00; F16L19/04; F16L27/04; F16L27/06; F16L27/073
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US954549A
Cited
US1597214A
Cited
US2025113A
Cited
US2511495A
Cited
GB590003A
Cited
US2511158A
Cited
FR1006009A
Cited
US2837360A
Cited
US2918313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |