US2884779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated gypsum core-board
Assignee: National Gypsum Co
•
Filing: 1953-08-31
•
Granted: 1959-05-05
•
Expires: 1973-08-31
Abstract
No abstract record available.
Inventors
- 👤 Rodney G Buergin
- 👤 John K Hovind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:32
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2110488A
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US2276471A
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US2314449A
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US2283582A
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GB540302A
Cited
GB541733A
Cited
US2305247A
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US2381635A
Cited
US2505903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |