US3814542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic pump shutdown circuit
Assignee: Sunoco Inc
•
Filing: 1972-06-30
•
Granted: 1974-06-04
•
Expires: 1992-06-30
Abstract
Abstract In response to a sustained drop in the vacuum in a pneumatic line, a circuit automatically shuts down the vacuum pump (which is coupled to the line) for a short interval, and then restarts the pump.
Inventors
- 👤 E Iglesias
- 👤 R Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:05
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/02; B; B65; B65G; B65G51/00; B65G51/04; B65G51/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
In combination, a vacuum pump normally operating to produce a partial vacuum in a line, a vacuum switch operated to the closed position in response to a decrease in the vacuum in said line to below a preset value, a first time delay relay connected in series with said switch and operating its contacts at the end of a first time interval, said relay having a pair of contacts which when operated act to shut down said pump; and a second time delay relay connected in series with said switch and operating its contacts at the end of a second time interval, said second relay having a pair of contacts which when operated act to start said pump.
Claim 2
Dependent Claim
118 words
In combination, a vacuum pump normally operating to produce a partial vacuum in a line, a vacuum switch operated to the closed position in response to a decrease in the vacuum in said line to below a preset value, a first time delay relay connected in series with said switch and operating its contacts at the end of a first time interval, said relay having a pair of contacts which when operated act to shut down said pump; and a second time delay relay connected in series with said switch and operating its contacts at the end of a second time interval, said second relay having a pair of contacts which when operated act to start said pump.
Claim 3
Dependent Claim
14 words
Combination of claim 1, wherein said second time interval exceeds said first time interval.
Claim 4
Dependent Claim
28 words
Combination of claim 1, wherein said second time interval is on the order of 60 seconds, and said first time interval is on the order of thirty seconds.
Claim 5
Dependent Claim
29 words
Combination set forth in claim 1, including also electrically energized counter means, said first relay having another pair of contacts which when operated cause energization of said counter means.
References Cited (Backward Citations)
US868464A
Cited
US2319935A
Cited
US2690291A
Cited
US2707440A
Cited
US2661697A
Cited
US2754763A
Cited
US2981195A
Cited
US3148622A
Cited
US3143969A
Cited
US3223041A
Cited
US3274940A
Cited
US3453962A
Cited
US3537472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |