US3394252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time-of-flight mass spectrometry apparatus having a plurality of chambers with electrically resistive coatings
Assignee: Dow Chemical Co
•
Filing: 1964-12-04
•
Granted: 1968-07-23
•
Expires: 1984-12-04
Abstract
No abstract record available.
Inventors
- 👤 Roland S Gohlke
- 👤 Franklin J Karle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:10
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/26; H01J49/34; H01J49/40
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |