US2639791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Window construction
Assignee: Brown & Grist Co
•
Filing: 1948-08-02
•
Granted: 1953-05-26
•
Expires: 1968-08-02
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Grist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:49
CPC Classifications
E; E06; E06B; E06B3/00; E06B3/32; E06B3/50; E06B3/5036; E06B3/5009
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1659103A
Cited
US1934290A
Cited
US2251251A
Cited
US2109973A
Cited
US2145357A
Cited
US2181385A
Cited
US2516075A
Cited
US2478061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |