Patent US2616152A successfully refreshed from Google Patents.
US2616152A
Expired / Lapsed
US
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Felt hardening machine
Assignee: American Felt Co
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Filing: 1950-09-08
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Granted: 1952-11-04
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Expires: 1970-09-08
Abstract
No abstract record available.
Inventors
- 👤 Ralph I Robbins
- 👤 Freyer Bela
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:30
CPC Classifications
D; D04; D04H; D04H17/00; D04H17/10; D04H17/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-04 | 1956-05-05 | 1956-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-04 | 1960-05-05 | 1960-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-04 | 1964-05-05 | 1964-11-04 | $7700.00 | Window Closed / Lapsed |