Patent US3595200A successfully refreshed from Google Patents.
US3595200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential pressure indicator
Assignee: Parker Hannifin Corp
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Filing: 1968-06-03
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Granted: 1971-07-27
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Expires: 1988-06-03
Abstract
Abstract A pressure-sensitive indicator comprises a housing having a first means movable towards and away from a first position. A second means, movable towards and away from the first means, is normally retained towards the first means when the first means is in the first position. The first and second means are spaced apart by separating means. The second means is retained away from the first means until the first means is returned to the first position.
Inventors
- 👤 Guido D Cilento
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:05
CPC Classifications
H; H01; H01H; H01H36/00; H01H36/008; B; B01; B01D; B01D35/00; B01D35/14; B01D35/143; H01H35/00; H01H35/24; H01H35/38; Y; Y10; Y10S; Y10S116/00; Y10S116/42
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
186 words
A pressure-sensitive device which comprises a housing; magnetic means fixed within said housing and defining therewith a first chamber and a second chamber; indicating means located in said first chamber, said indicating means being movable from a first position adjacent said magnetic means to a second position away from said magnetic means; pressure-sensitive means located in said second chamber, said pressure sensitive means being movable from a first position adjacent said magnetic means to a second position away from said magnetic means; first biasing means located in said first chamber for maintaining said indicating means its second position; second biasing means located in said second chamber for maintaining said pressure sensitive means in its first position; said magnetic means having a variable flux of lines of force such that when said pressure sensitive means is in its first position said indicating means is held by said magnetic means in its first position and when said pressure-sensitive means is in its first position and when said pressure-sensitive means is in its second position said indicating means is held in its second position by said first biasing means.
Claim 2
Dependent Claim
186 words
A pressure-sensitive device which comprises a housing; magnetic means fixed within said housing and defining therewith a first chamber and a second chamber; indicating means located in said first chamber, said indicating means being movable from a first position adjacent said magnetic means to a second position away from said magnetic means; pressure-sensitive means located in said second chamber, said pressure sensitive means being movable from a first position adjacent said magnetic means to a second position away from said magnetic means; first biasing means located in said first chamber for maintaining said indicating means its second position; second biasing means located in said second chamber for maintaining said pressure sensitive means in its first position; said magnetic means having a variable flux of lines of force such that when said pressure sensitive means is in its first position said indicating means is held by said magnetic means in its first position and when said pressure-sensitive means is in its first position and when said pressure-sensitive means is in its second position said indicating means is held in its second position by said first biasing means.
Claim 3
Dependent Claim
27 words
A device according to claim 1 wherein said indicating means is provided with a thermoresponsive member which maintains it in its first position below a predetermined temperature.
Claim 4
Dependent Claim
27 words
A device according to claim 1 wherein said pressure-sensitive means is provided with a thermoresponsive member which maintains it in its first position below a predetermined temperature.
Claim 5
Dependent Claim
21 words
A device according to claim 1 wherein said pressure-sensitive means is moved to its second position by a predetermined pressure differential.
Claim 6
Dependent Claim
18 words
A device according to claim 1 wherein said indicating means is maintained in its second position until reset.
References Cited (Backward Citations)
US1976230A
Cited
US2280437A
Cited
US2694166A
Cited
US2907992A
Cited
US3026903A
Cited
US3089066A
Cited
US3154049A
Cited
US3220375A
Cited
US3140690A
Cited
US3413951A
Cited
US3364897A
Cited
US3412706A
Cited
US3354336A
Cited
US3448716A
Cited
US3442248A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |