US2973152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering cork-like material from birch tree bark
Assignee: Individual
•
Filing: 1958-07-24
•
Granted: 1961-02-28
•
Expires: 1978-07-24
Abstract
No abstract record available.
Inventors
- 👤 Owens Robert Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:44
CPC Classifications
B; B27; B27L; B27L11/00; B02; B02C; B02C18/00; B02C18/06; B02C18/14; B02C18/144; B27J; B27J5/00; B02C23/00; B02C23/08; B02C23/16; B02C2023/165
Claims Analysis
Total Claims: 0
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US2764289A
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US577278A
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US2444929A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |