Patent US1972468A successfully refreshed from Google Patents.
US1972468A
Expired / Lapsed
US
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Tar distillation
Assignee: Barrett Co Inc
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Filing: 1930-03-31
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Granted: 1934-09-04
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Expires: 1950-03-31
Abstract
No abstract record available.
Inventors
- 👤 Jr Joseph Zavertnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:42
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/02; C10C3/04; E; E21; E21B; E21B43/00; E21B43/02; E21B43/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1937-09-03 | 1938-03-05 | 1938-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-09-03 | 1942-03-05 | 1942-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-09-03 | 1946-03-05 | 1946-09-04 | $7700.00 | Window Closed / Lapsed |