US3438539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sight glass for reaction vessels
Assignee: Individual
•
Filing: 1965-10-22
•
Granted: 1969-04-15
•
Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Gene Le Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:24
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/004; G; G02; G02B; G02B7/00; G02B7/007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1703426A
Cited
DE555008C
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US2423491A
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US2491758A
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US2773387A
Cited
US2942469A
Cited
US3103083A
Cited
GB874884A
Cited
US3148543A
Cited
US3307400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |