Patent US2990650A successfully refreshed from Google Patents.
US2990650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roofing
Assignee: Individual
•
Filing: 1957-04-29
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Granted: 1961-07-04
•
Expires: 1977-04-29
Abstract
No abstract record available.
Inventors
- 👤 Charles W Attwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:34
CPC Classifications
E; E04; E04D; E04D11/00; E04D11/02; E04D5/00; E04D5/14; E04D5/141; E04D5/143; E04D5/144; E04D5/146; E04D5/147; E04D5/148
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |