US3539423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a fiberboard of varying density
Assignee: Owens Corning
•
Filing: 1968-11-12
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Granted: 1970-11-10
•
Expires: 1988-11-12
Abstract
No abstract record available.
Inventors
- 👤 Allen L Simison
- 👤 Clayton A Smucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:06
CPC Classifications
B; B27; B27N; B27N3/00; B27N3/08; B27N3/10; B29; B29C; B29C70/00; B29C70/003; B29C70/04; B29C70/28; B29C70/40; B29C70/50; B29C70/504; B29C70/506; E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/16; B29K; B29K2309/00; B29K2309/08; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1023; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249942; Y10T428/249946
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3276928A
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US3141809A
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US3025197A
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US3230995A
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US3265530A
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US3222237A
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US3272897A
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US3328086A
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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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |