US3250873A
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Assignee: Marvel Engineering Co
•
Filing: 1964-03-20
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Granted: 1966-05-10
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Expires: 1984-03-20
Abstract
No abstract record available.
Inventors
- 👤 Walter J Kudlaty
- 👤 Theodore B Holliday
- 👤 Luchetta Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:13
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D35/143; H; H01; H01H; H01H35/00; H01H35/24; H01H35/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A FILTER INDICATOR COMPRISING A HOUSING, A DIAPHRAGM DIVIDING SAID HOUSING INTO A FIRST CHAMBER AND A SECOND CHAMBER, AN INLET PASSAGE COMMUNICATING WITH SAID FIRST CHAMBER ON ONE SIDE OF SAID DIAPHRAGM, AN INDICATOR ROD SLIDABLY MOUNTED IN A WALL OF SAID HOUSING AND EXTENDING INTO SAID SECOND CHAMBER, MAGNETICALLY ATTRACTED ELEMENTS CARRIED BY SAID DIAPHRAGM AND SAID ROD FOR NORMAL DIRECT, SURFACE-TO-SURFACE CONTACT ONE WITH THE OTHER, YIELDING MEANS DIRECTLY ENGAGING AT LEAST ONE OF SAID ELEMENTS AND URGING SAID MAGNETICALLY ATTRACHED ELEMENTS APART WHENEVER SAID ELEMENTS ARE OUT OF CONTACT WITH EACH OTHER AND URGING SAID ROD OUTWARDLY OF SAID HOUSING.
Claim 2
Dependent Claim
104 words
A FILTER INDICATOR COMPRISING A HOUSING, A DIAPHRAGM DIVIDING SAID HOUSING INTO A FIRST CHAMBER AND A SECOND CHAMBER, AN INLET PASSAGE COMMUNICATING WITH SAID FIRST CHAMBER ON ONE SIDE OF SAID DIAPHRAGM, AN INDICATOR ROD SLIDABLY MOUNTED IN A WALL OF SAID HOUSING AND EXTENDING INTO SAID SECOND CHAMBER, MAGNETICALLY ATTRACTED ELEMENTS CARRIED BY SAID DIAPHRAGM AND SAID ROD FOR NORMAL DIRECT, SURFACE-TO-SURFACE CONTACT ONE WITH THE OTHER, YIELDING MEANS DIRECTLY ENGAGING AT LEAST ONE OF SAID ELEMENTS AND URGING SAID MAGNETICALLY ATTRACHED ELEMENTS APART WHENEVER SAID ELEMENTS ARE OUT OF CONTACT WITH EACH OTHER AND URGING SAID ROD OUTWARDLY OF SAID HOUSING.
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) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |