Patent US3498015A successfully refreshed from Google Patents.
US3498015A
Expired / Lapsed
US
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Poured gypsum roof structure with lower vent means for removing excess moisture
Assignee: DONALD A GREEN
•
Filing: 1966-11-15
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Granted: 1970-03-03
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Expires: 1986-11-15
Abstract
No abstract record available.
Inventors
- 👤 Paul A Seaburg
- 👤 Donald A Green
- 👤 James M Galloway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:40
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/17; E04D13/16; E04D13/1606; E04D13/1668; E04D7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US407376A
Cited
USRE26141E
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US1501850A
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US2121789A
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US3193971A
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US3203146A
Cited
US3276171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |