US2990710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulp bleaching apparatus
Assignee: Improved Machinery Inc
•
Filing: 1958-10-13
•
Granted: 1961-07-04
•
Expires: 1978-10-13
Abstract
No abstract record available.
Inventors
- 👤 Elmer R Burling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:27
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
BE529983A
Cited
US2198709A
Cited
US2516447A
Cited
US2774654A
Cited
US2706390A
Cited
US2764011A
Cited
US2711359A
Cited
US2873600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |