Patent US3231285A successfully refreshed from Google Patents.
US3231285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary shaft seal
Assignee: Allis Chalmers Corp
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Filing: 1962-12-17
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Granted: 1966-01-25
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Expires: 1982-12-17
Abstract
No abstract record available.
Inventors
- 👤 Wilton W Weltmer
- 👤 Milton W Lutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:47
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/44; F16J15/447; F16J15/4472
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A ROTARY SHAFT SEAL FOR RESTRICTING FLUID FLOW FROM A HIGH PRESSURE AREA TO A LOW PRESSURE AREA COMPRISING: A ROTARY SHAFT HAVING A PLURALITY OF AXIALLY SPACED ANNULAR STEPPED PORTIONS THEREON; A STATIONARY BUSHING SURROUNDING SAID SHAFT AND HAVING CORRESPONDING ANNULAR STEPPED PORTIONS ON THE INNER PERIPHERY THEREOF, SAID BUSHING AND SAID SHAFT DEFINING A FLOW RESTRICTING STEPPED CHANNEL THEREBETWEEN; A FIRST SET OF AXIALLY SPACED ANNULAR GROOVES IN SAID SHAFT CONNECTING ADJACENT STEPPED PORTIONS OF SAID SHAFT; AND A SECOND SET OF AXIALLY SPACED ANNULAR GROOVES IN THE INNER SURFACE OF SAID BUSHING CON-
Claim 2
Dependent Claim
96 words
A ROTARY SHAFT SEAL FOR RESTRICTING FLUID FLOW FROM A HIGH PRESSURE AREA TO A LOW PRESSURE AREA COMPRISING: A ROTARY SHAFT HAVING A PLURALITY OF AXIALLY SPACED ANNULAR STEPPED PORTIONS THEREON; A STATIONARY BUSHING SURROUNDING SAID SHAFT AND HAVING CORRESPONDING ANNULAR STEPPED PORTIONS ON THE INNER PERIPHERY THEREOF, SAID BUSHING AND SAID SHAFT DEFINING A FLOW RESTRICTING STEPPED CHANNEL THEREBETWEEN; A FIRST SET OF AXIALLY SPACED ANNULAR GROOVES IN SAID SHAFT CONNECTING ADJACENT STEPPED PORTIONS OF SAID SHAFT; AND A SECOND SET OF AXIALLY SPACED ANNULAR GROOVES IN THE INNER SURFACE OF SAID BUSHING CON-
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |