US2982671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impregnated carbon seals
Assignee: Napier Turbochargers Ltd
•
Filing: 1958-02-19
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Granted: 1961-05-02
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Expires: 1978-02-19
Abstract
No abstract record available.
Inventors
- 👤 Donald N Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:35
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3496; C; C08; C08F; C08F26/00; C08F26/06; C08F26/12; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
A METHOD OF MAKING A CARBON SEAL SUBSTANTIALLY IMPERVIOUS TO FLUID WHICH INCLUDES THE STEPS OF PLACING A CARBON BODY ON A BLOCK OF SOLID N-VINYL CARBAZOLE IMPREGNATING MATERIAL IN AN AIR-TIGHT CHAMBER, APPLYING A VACUUM TO THE CHAMBER, HEATING THE CHAMBER SUFFICIENTLY TO CAUSE THE IMPREGNATING MATERIAL TO MELT AND ALLOW THE CARBON BODY TO SINK INTO IT, RELEASING THE VACUUM AND PRESSURIZING THE CHAMBER, AND REMOVING FROM THE CHAMBER THE IMPREGNATED CARBON BODY AND HEATING THE SAID BODY UNTIL THE IMPREGNATING MATERIAL IS FULLY POLYMERIZED.
References Cited (Backward Citations)
US1756323A
Cited
US2027505A
Cited
US2174887A
Cited
US2561132A
Cited
US2554254A
Cited
US2682626A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |