US2779723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Still extractor
Assignee: AT&T Inc
•
Filing: 1953-01-12
•
Granted: 1957-01-29
•
Expires: 1973-01-12
Abstract
No abstract record available.
Inventors
- 👤 Milton C Prymek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:10
CPC Classifications
B; B01; B01D; B01D3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US482581A
Cited
US863031A
Cited
US1461108A
Cited
US1466535A
Cited
DE404696C
Cited
US2157683A
Cited
US2295098A
Cited
US2283904A
Cited
US2398836A
Cited
FR977304A
Cited
FR1012988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |