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Patent US3120979A successfully refreshed from Google Patents.
US3120979A
Expired / Lapsed
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Pneumatic materials conveying system
Assignee: Individual
•
Filing: 1961-11-06
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Granted: 1964-02-11
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Expires: 1981-11-06
Abstract
No abstract record available.
Inventors
- 👤 Lawrence D Mcdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:16
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/34; B65G53/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
IN A PNEUMATIC CONVEYING SYSTEM, A HEADER, A PLURALITY OF AIR PUMPS CONNECTED WITH SAID HEADER AND OPERABLE, WHEN ENERGIZED, TO SUPPLY AIR TO SAID HEADER, A PLURALITY OF BRANCH DISCHARGE LINES EACH CONNECTED WITH SAID HEADER, EACH SAID LINE HAVING INTERPOSED THEREIN A VARIABLE THROTTLING VALVE, VELOCITY SENSING MEANS LOCATED IN EACH LINE, CONTROL MEANS FOR EACH VALVE OPERABLY CONNECTED WITH THE SENSING MEANS IN THE LINE CONTAINING SUCH VALVE, EACH SAID CONTROL MEANS OPERABLE TO VARY THE VALVE IN A DIRECTION TO TEND TO MAINTAIN THE VELOCITY THROUGH SAID LINE CONSTANT DESPITE CHANGES IN STATIC PRESSURE IN THE LINE, AND MEANS OPERABLE TO VARY THE STATIC PRESSURE IN SAID HEADER AT A PREDETERMINED DIFFERENTIAL RELATIONSHIP WITH THE HIGHEST OF THE STATIC PRESSURES IN THE RESPECTIVE LINES.
Claim 2
Dependent Claim
128 words
IN A PNEUMATIC CONVEYING SYSTEM, A HEADER, A PLURALITY OF AIR PUMPS CONNECTED WITH SAID HEADER AND OPERABLE, WHEN ENERGIZED, TO SUPPLY AIR TO SAID HEADER, A PLURALITY OF BRANCH DISCHARGE LINES EACH CONNECTED WITH SAID HEADER, EACH SAID LINE HAVING INTERPOSED THEREIN A VARIABLE THROTTLING VALVE, VELOCITY SENSING MEANS LOCATED IN EACH LINE, CONTROL MEANS FOR EACH VALVE OPERABLY CONNECTED WITH THE SENSING MEANS IN THE LINE CONTAINING SUCH VALVE, EACH SAID CONTROL MEANS OPERABLE TO VARY THE VALVE IN A DIRECTION TO TEND TO MAINTAIN THE VELOCITY THROUGH SAID LINE CONSTANT DESPITE CHANGES IN STATIC PRESSURE IN THE LINE, AND MEANS OPERABLE TO VARY THE STATIC PRESSURE IN SAID HEADER AT A PREDETERMINED DIFFERENTIAL RELATIONSHIP WITH THE HIGHEST OF THE STATIC PRESSURES IN THE RESPECTIVE LINES.
References Cited (Backward Citations)
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Cited
US2665707A
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US2726122A
Cited
US2770584A
Cited
US2884940A
Cited
US3002521A
Cited
US3005462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-10 | 1967-08-12 | 1968-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-10 | 1971-08-12 | 1972-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-10 | 1975-08-12 | 1976-02-11 | $7700.00 | Window Closed / Lapsed |