Patent US3233987A successfully refreshed from Google Patents.
US3233987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas mixing
Assignee: Selas Corp of America
•
Filing: 1963-08-21
•
Granted: 1966-02-08
•
Expires: 1983-08-21
Abstract
No abstract record available.
Inventors
- 👤 Hepburn Louis Le Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:20
CPC Classifications
B; B01; B01F; B01F35/00; B01F35/80; B01F35/83; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/0352; Y10T137/2496; Y10T137/2499; Y10T137/2559; Y10T137/2564
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
APPARATUS FOR MIXING GASES COMPRISING A GAS MIXING DEVICE, MEANS TO SUPPLY A FIRST GAS TO SAID DEVICE UNDER GRADUALLY INCREASING PRESSURE TO A FIXED PREDETERMINED PRESSURE, MEANS TO SUPPLY A SECOND GAS UNDER PRESSURE TO SAID DEVICE, MEANS TO ADJUST THE PRESSURE OF THE SECOND GAS SUBSTANTIALLY TO EQUAL THAT OF THE FIRST GAS AS SAID FIRST GAS IS INCREASING IN PRESSURE OF SAID PREDETERMINED PRESSURE, MEANS TO WITHDRAW MIXED GASES FROM SIAD DEVICE, A CONTROL INSTRUMENT RESPONSIVE TO THE PRESSURE OF THE MIXED GASES, AND VALVE MEANS TO CONTROL THE SUPPLY OF SAID FIRST GAS TO SAID DEVICE AND MEANS TO OPERATE SAID VALVE MEANS BY SAID CONTROL INSTRUMENT.
Claim 2
Dependent Claim
111 words
APPARATUS FOR MIXING GASES COMPRISING A GAS MIXING DEVICE, MEANS TO SUPPLY A FIRST GAS TO SAID DEVICE UNDER GRADUALLY INCREASING PRESSURE TO A FIXED PREDETERMINED PRESSURE, MEANS TO SUPPLY A SECOND GAS UNDER PRESSURE TO SAID DEVICE, MEANS TO ADJUST THE PRESSURE OF THE SECOND GAS SUBSTANTIALLY TO EQUAL THAT OF THE FIRST GAS AS SAID FIRST GAS IS INCREASING IN PRESSURE OF SAID PREDETERMINED PRESSURE, MEANS TO WITHDRAW MIXED GASES FROM SIAD DEVICE, A CONTROL INSTRUMENT RESPONSIVE TO THE PRESSURE OF THE MIXED GASES, AND VALVE MEANS TO CONTROL THE SUPPLY OF SAID FIRST GAS TO SAID DEVICE AND MEANS TO OPERATE SAID VALVE MEANS BY SAID CONTROL INSTRUMENT.
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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |