US3884077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rate of pressure change sensing system
Assignee: Southwestern Manufacturing Co
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Filing: 1973-06-01
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Granted: 1975-05-20
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Expires: 1993-06-01
Abstract
Abstract A new and improved system for sensing an abnormal, large or small change, which may be either an increase or a decrease, in fluid pressure within or after a specified time interval.
Inventors
- 👤 Jr Lawrence F Athy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:06
CPC Classifications
G; G01; G01L; G01L11/00; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/28; G01M3/2807; G01M3/2815
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
155 words
A system for sensing an abnormal change in pressure in a fluid handling system within a reference time interval, comprising: a. means for establishing a first fixed pressure threshold level; b. first sensor means for sensing a first change in the fluid pressure in the system with respect to the first fixed pressure threshold level; c. means for establishing a second fluid pressure threshold level; d. seconD sensor means for sensing a second change in the fluid pressure in the system with respect to the second fixed pressure threshold level; e. timing means for establishing a reference time interval for occurrence of an abnormal pressure change in the form of said first change and said second change; and f. output means for forming an output signal in response to occurrence of said first change and said second change within the reference time interval established by said timing means to thereby indicate the abnormal pressure change.
Claim 2
Independent Claim
155 words
A system for sensing an abnormal change in pressure in a fluid handling system within a reference time interval, comprising: a. means for establishing a first fixed pressure threshold level; b. first sensor means for sensing a first change in the fluid pressure in the system with respect to the first fixed pressure threshold level; c. means for establishing a second fluid pressure threshold level; d. seconD sensor means for sensing a second change in the fluid pressure in the system with respect to the second fixed pressure threshold level; e. timing means for establishing a reference time interval for occurrence of an abnormal pressure change in the form of said first change and said second change; and f. output means for forming an output signal in response to occurrence of said first change and said second change within the reference time interval established by said timing means to thereby indicate the abnormal pressure change.
Claim 3
Dependent Claim
24 words
The structure of claim 1, wherein said output means comprises: output means for forming a fluid pressure signal whose presence forms the output signal.
Claim 4
Dependent Claim
23 words
The structure of claim 1, wherein said output means comprises: output means for removing a fluid pressure whose absence indicates the output signal.
Claim 5
Dependent Claim
27 words
The structure of claim 1, wherein said first sensor means comprises: first sensor means for sensing an increase in fluid pressure above the first pressure threshold level.
Claim 6
Dependent Claim
27 words
The structure of claim 1, wherein said first sensor means comprises: first sensor means for sensing a decrease in fluid pressure below the first pressure threshold level.
Claim 7
Dependent Claim
27 words
The structure of claim 1, wherein said second sensor means comprises: second sensor means for sensing an increase in fluid pressure above the second pressure threshold level.
Claim 8
Dependent Claim
27 words
The structure of claim 1, wherein said second sensor means comprises: second sensor means for sensing a decrease in fluid pressure below the second pressure threshold level.
Claim 9
Dependent Claim
36 words
The structure of claim 1, wherein said timing means comprises: timing means for establishing a reference time interval during which said first change and said second change must occur in order to activate said output means.
Claim 10
Dependent Claim
77 words
The structure of claim 1, wherein said timing means comprises: a. timing means for establishing a reference time interval beginning when said first sensor means senses said first change and lasting a predetermined time interval thereafter; and b. said timing means further comprising means forming a time interval beginning on occurrence of said first change, which must elapse before said second change occurs in order for an output indication of the abnormal pressure change to be formed.
References Cited (Backward Citations)
US3612081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |