Patent US2749581A successfully refreshed from Google Patents.
US2749581A
Expired / Lapsed
US
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Light control means
Assignee: Individual
•
Filing: 1949-05-12
•
Granted: 1956-06-12
•
Expires: 1969-05-12
Abstract
No abstract record available.
Inventors
- 👤 Charles W Mccormick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:45
CPC Classifications
E; E06; E06B; E06B7/00; E06B7/02; E06B7/08; E06B7/084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL44820C
Cited
US1713337A
Cited
US1677910A
Cited
US1718754A
Cited
US2173275A
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US2288521A
Cited
US2238648A
Cited
US2552406A
Cited
US2546335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |