US2720108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas analysis apparatus
Assignee: Johnson-Williams Inc
•
Filing: 1953-07-28
•
Granted: 1955-10-11
•
Expires: 1973-07-28
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:39
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/14; G01N27/16; G01N27/18; G01N27/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
IN A GAS ANALYSIS APPARATUS, AN ELECTRIC CIRCUIT FOR ENERGIZING SAID ANALYSIS APPARATUS, VACUUM MEANS FOR DRAWING A GAS SAMPLE INTO A CHAMBER FOR ANALYSIS, A VACUUM OPERATED SWITCH WHEREBY THE ELECTRIC CIRCUIT IS CLOSED UPON ACTUATION OF THE VACUUM MEANS, AND A CHECK VALVE BETWEEN SAID VACUUM OPERATED SWITCH AND SAID VACUUM MEANS, AND MEANS FOR SLOWLY BLEEDING AIR INTO SAID VACUUM OPERATED SWITCH WHEREBY THE SWITCH WILL BE OPENED AFTER A LAPSE OF TIME.
Claim 2
Dependent Claim
76 words
IN A GAS ANALYSIS APPARATUS, AN ELECTRIC CIRCUIT FOR ENERGIZING SAID ANALYSIS APPARATUS, VACUUM MEANS FOR DRAWING A GAS SAMPLE INTO A CHAMBER FOR ANALYSIS, A VACUUM OPERATED SWITCH WHEREBY THE ELECTRIC CIRCUIT IS CLOSED UPON ACTUATION OF THE VACUUM MEANS, AND A CHECK VALVE BETWEEN SAID VACUUM OPERATED SWITCH AND SAID VACUUM MEANS, AND MEANS FOR SLOWLY BLEEDING AIR INTO SAID VACUUM OPERATED SWITCH WHEREBY THE SWITCH WILL BE OPENED AFTER A LAPSE OF TIME.
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) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |