Patent US2829337A successfully refreshed from Google Patents.
US2829337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring very low gas pressures
Assignee: US Philips Corp
•
Filing: 1954-06-11
•
Granted: 1958-04-01
•
Expires: 1974-06-11
Abstract
No abstract record available.
Inventors
- 👤 Groendijk Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:13
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/02; H01J41/04; G; G01; G01L; G01L21/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A DEVICE FOR MEASURING LOW GAS PRESSURE COMPRISING AN ENVELOPE INCLUDING MEANS FOR COMMUNICATING WITH THE SPACE WHEREIN THE GAS PRESSURE IS TO BE MEASURED, A HOLLOW GRID-LIKE ELECTRODE IN SAID ENVELOPE, AN ELONGATED THIN COLLECTOR ELECTRODE WITHIN SAID HOLLOW GRID-LIKE ELECTRODE, AN ELECTRON-EMITTING CATHODE IN SAID ENVELOPE BUT OUTSIDE SAID GRID-LIKE ELECTRODE, AN ADDITIONAL ELECTRODE INSIDE SAID GRID-LIKE ELECTRODE AND POSITIONED SUCH THAT THE COLLECTOR ELECTRODE IS DISPOSED SUBSTANTIALLY BETWEEN IT AND THE CATHODE, MEANS MAINTAINING THE ADDITIONAL AND GRID-LIKE ELECTRODES AT A POSITVE POTENTIAL RELATIVE TO THE CATHODE AND THE COLLECTOR ELECTRODE AT A NEGATIVE POTENTIAL RELATIVE TO THE CATHODE, AND MEANS COUPLED TO SAID ADDITIONAL ELECTRODE FOR ABSTRACTING ELECTRICAL INFORMATION THEREFROM CONCERNING THE AMOUNT OF ELECTRON COLLECTION THEREBY.
Claim 2
Independent Claim
121 words
A DEVICE FOR MEASURING LOW GAS PRESSURE COMPRISING AN ENVELOPE INCLUDING MEANS FOR COMMUNICATING WITH THE SPACE WHEREIN THE GAS PRESSURE IS TO BE MEASURED, A HOLLOW GRID-LIKE ELECTRODE IN SAID ENVELOPE, AN ELONGATED THIN COLLECTOR ELECTRODE WITHIN SAID HOLLOW GRID-LIKE ELECTRODE, AN ELECTRON-EMITTING CATHODE IN SAID ENVELOPE BUT OUTSIDE SAID GRID-LIKE ELECTRODE, AN ADDITIONAL ELECTRODE INSIDE SAID GRID-LIKE ELECTRODE AND POSITIONED SUCH THAT THE COLLECTOR ELECTRODE IS DISPOSED SUBSTANTIALLY BETWEEN IT AND THE CATHODE, MEANS MAINTAINING THE ADDITIONAL AND GRID-LIKE ELECTRODES AT A POSITVE POTENTIAL RELATIVE TO THE CATHODE AND THE COLLECTOR ELECTRODE AT A NEGATIVE POTENTIAL RELATIVE TO THE CATHODE, AND MEANS COUPLED TO SAID ADDITIONAL ELECTRODE FOR ABSTRACTING ELECTRICAL INFORMATION THEREFROM CONCERNING THE AMOUNT OF ELECTRON COLLECTION THEREBY.
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) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |