US3088442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallic shaft seal
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1961-01-06
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Granted: 1963-05-07
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Expires: 1981-01-06
Abstract
No abstract record available.
Inventors
- 👤 Richard E Self
- 👤 Arthur R Allan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:22
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A LINEAR SERVOMECHANISM ACTUATOR UNIT COMPRISING: AN ACTUATOR HOUSING; A RECIPROCABLE PISTON SHAFT IN SAID HOUSING COOPERATING THEREWITH TO DEFINE AT LEAST TWO PRESSURIZABLE COMPARTMENTS; AND AT LEAST ONE PISTON SHAFT RECEIVING MEMBER CLOSING AN END OF SAID HOUSING, SAID MEMBER NORMALLY CONTACTING SAID PISTON SHAFT TO PREVENT INTRODUCTION OF FOREIGN MATTER ALONG SAID PISTON SHAFT INTO SAID HOUSING, SAID MEMBER BEING OPERATIVELY RESPONSIVE TO PRESSURE FORCES IN SAID HOUSING TO ROCK FROM CONTACT WITH SAID SHAFT TO THEREBY PERMIT RECIPROCATING MOVEMENT OF SAID SHAFT.
Claim 2
Dependent Claim
85 words
A LINEAR SERVOMECHANISM ACTUATOR UNIT COMPRISING: AN ACTUATOR HOUSING; A RECIPROCABLE PISTON SHAFT IN SAID HOUSING COOPERATING THEREWITH TO DEFINE AT LEAST TWO PRESSURIZABLE COMPARTMENTS; AND AT LEAST ONE PISTON SHAFT RECEIVING MEMBER CLOSING AN END OF SAID HOUSING, SAID MEMBER NORMALLY CONTACTING SAID PISTON SHAFT TO PREVENT INTRODUCTION OF FOREIGN MATTER ALONG SAID PISTON SHAFT INTO SAID HOUSING, SAID MEMBER BEING OPERATIVELY RESPONSIVE TO PRESSURE FORCES IN SAID HOUSING TO ROCK FROM CONTACT WITH SAID SHAFT TO THEREBY PERMIT RECIPROCATING MOVEMENT OF SAID SHAFT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-06 | 1966-11-05 | 1967-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-06 | 1970-11-05 | 1971-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-06 | 1974-11-05 | 1975-05-07 | $7700.00 | Window Closed / Lapsed |