US3347418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid dispenser utilizing controlled gas pressure
Assignee: Polaroid Corp
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Filing: 1965-10-23
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Granted: 1967-10-17
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Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Gerald B Fefferman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:54
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/688; G; G05; G05D; G05D7/00; G05D7/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
APPARATUS FOR DISPENSING A LIQUID AT A CONTROLLED RATE OF FLOW COMPRISING: (A) A CLOSED RESERVOIR FOR SAID LIQUID, SAID RESERVOIR HAVING AN OUTLET AND AN INLET PORT; (B) VALVE MEANS COUPLED WITH SAID OUTLET PORT TO CONTROL SAID RATE OF FLOW OF SAID LIQUID FROM SAID RESERVOIR; (C) GAS SUPPLY MEANS COUPLED WITH SAID INLET PORT TO FORCE SAID LIQUID FROM SAID RESERVOIR, SAID GAS SUPPLY MEANS HAVING MEANS TO REGULATE THE PRESSURE OF SAID GAS TO A SUBSTANTIALLY CONSTANT VALUE; AND (D) MEANS RESPONSIVE TO THE MASS FLOW RATE OF SAID GAS FOR ADJUSTING SAID VALVE MEANS SO THAT A PREDETERMINED MASS FLOW RATE OF GAS IS MAINTAINED.
Claim 2
Dependent Claim
110 words
APPARATUS FOR DISPENSING A LIQUID AT A CONTROLLED RATE OF FLOW COMPRISING: (A) A CLOSED RESERVOIR FOR SAID LIQUID, SAID RESERVOIR HAVING AN OUTLET AND AN INLET PORT; (B) VALVE MEANS COUPLED WITH SAID OUTLET PORT TO CONTROL SAID RATE OF FLOW OF SAID LIQUID FROM SAID RESERVOIR; (C) GAS SUPPLY MEANS COUPLED WITH SAID INLET PORT TO FORCE SAID LIQUID FROM SAID RESERVOIR, SAID GAS SUPPLY MEANS HAVING MEANS TO REGULATE THE PRESSURE OF SAID GAS TO A SUBSTANTIALLY CONSTANT VALUE; AND (D) MEANS RESPONSIVE TO THE MASS FLOW RATE OF SAID GAS FOR ADJUSTING SAID VALVE MEANS SO THAT A PREDETERMINED MASS FLOW RATE OF GAS IS MAINTAINED.
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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |