US2686461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing acoustic fiberboard by perforating wet fiber mat
Assignee: Wood Conversion Co
•
Filing: 1948-09-23
•
Granted: 1954-08-17
•
Expires: 1968-09-23
Abstract
No abstract record available.
Inventors
- 👤 Clark C Heritage
- 👤 George W Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:21
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/86; D; D21; D21J; D21J1/00; E04B2001/8245; E04B2001/8457; E04B2001/8476; E04B2001/848
Claims Analysis
Total Claims: 0
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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) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |