Patent US3374858A successfully refreshed from Google Patents.
US3374858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic filter with plural helical passages
Assignee: Individual
•
Filing: 1966-08-24
•
Granted: 1968-03-26
•
Expires: 1986-08-24
Abstract
No abstract record available.
Inventors
- 👤 John F Richards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:27
CPC Classifications
F; F16; F16K; F16K47/00; F16K47/08; F16K47/12; F16L; F16L55/00; F16L55/02; F16L55/027; F16L55/02772
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
AN IMPROVED ACOUSTIC FILTER FOR DECREASING PRESSURE PULSATIONS IN A FLUID LINE COMPRISING: A CLOSED HOUSING HAVING AN INLET PORT AND AN OUTLET PORT CONNECTED IN SERIES WITH SAID LINE; FIRST PARTITION MEANS DEFINING WITH SAID HOUSING AN INLET CHAMBER AND AN OUTLET CHAMBER COMMUNICATING, RESPECTIVELY, WITH SAID INLET PORT AND OUTLET PORT; SECOND PARTITION MEANS DEFINING WITH SAID HOUSING AN INTERMEDIATE CHAMBER SEPARATED FROM SAID INLET CHAMBER AND SAID OUTLET CHAMBER; A FIRST HELICAL PASSAGE EXTENDING CIRCUMFERENTIALLY WITHIN SAID HOUSING FROM SAID INLET CHAMBER TO SAID OUTLET CHAMBER; A SECOND HELICAL PASSAGE EXTENDING CIRCUMFERENTIALLY WITHIN SAID HOUSING FROM SAID INLET CHAMBER TO SAID INTERMEDIATE CHAMBER;
Claim 2
Dependent Claim
106 words
AN IMPROVED ACOUSTIC FILTER FOR DECREASING PRESSURE PULSATIONS IN A FLUID LINE COMPRISING: A CLOSED HOUSING HAVING AN INLET PORT AND AN OUTLET PORT CONNECTED IN SERIES WITH SAID LINE; FIRST PARTITION MEANS DEFINING WITH SAID HOUSING AN INLET CHAMBER AND AN OUTLET CHAMBER COMMUNICATING, RESPECTIVELY, WITH SAID INLET PORT AND OUTLET PORT; SECOND PARTITION MEANS DEFINING WITH SAID HOUSING AN INTERMEDIATE CHAMBER SEPARATED FROM SAID INLET CHAMBER AND SAID OUTLET CHAMBER; A FIRST HELICAL PASSAGE EXTENDING CIRCUMFERENTIALLY WITHIN SAID HOUSING FROM SAID INLET CHAMBER TO SAID OUTLET CHAMBER; A SECOND HELICAL PASSAGE EXTENDING CIRCUMFERENTIALLY WITHIN SAID HOUSING FROM SAID INLET CHAMBER TO SAID INTERMEDIATE CHAMBER;
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-26 | 1971-09-25 | 1972-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-26 | 1975-09-25 | 1976-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-26 | 1979-09-25 | 1980-03-26 | $7700.00 | Window Closed / Lapsed |