Patent US2565308A successfully refreshed from Google Patents.
Patent US2684093A successfully refreshed from Google Patents.
US2684093A
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Process and apparatus for increasing sound absorbing properties of acoustical material
Assignee: Minnesota and Ontario Paper Co
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Filing: 1952-06-07
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Granted: 1954-07-20
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Expires: 1972-06-07
Abstract
No abstract record available.
Inventors
- 👤 Enzmann Ralph
- 👤 Edgar A Lauring
- 👤 Wilbert J E Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:39
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/86; E04B2001/8245; E04B2001/8457; E04B2001/8476; E04B2001/848; Y; Y10; Y10S; Y10S29/00; Y10S29/084; Y10T; Y10T408/00; Y10T408/44; Y10T408/45; Y10T408/458; Y10T409/00; Y10T409/30; Y10T409/304088; Y10T409/304536; Y10T409/30532; Y10T409/305432
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US751253A
Cited
US994430A
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US1471246A
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US1982713A
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US2142711A
Cited
US2234739A
Cited
US2434750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-19 | 1958-01-18 | 1958-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-19 | 1962-01-18 | 1962-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-19 | 1966-01-18 | 1966-07-20 | $7700.00 | Window Closed / Lapsed |