US3488904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw-holding frangible board
Assignee: National Gypsum Co
•
Filing: 1968-03-06
•
Granted: 1970-01-13
•
Expires: 1988-03-06
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Schneller
- 👤 Jack A Dawdy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:26
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/74; E04B2/7401; E04C; E04C2/00; E04C2/02; E04C2/26; E04C2/28; E04C2/30; E04C2/34; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2242834A
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US1486113A
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US2075773A
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US2249590A
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US2361733A
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US2797573A
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US2884779A
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US3300933A
Cited
US3336710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |