US1254520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined light and air transmitting apparatus.
Assignee: Individual
•
Filing: 1916-10-14
•
Granted: 1918-01-22
•
Expires: 1936-10-14
Abstract
No abstract record available.
Inventors
- 👤 Daniel M Macduff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:24
CPC Classifications
F; F21; F21S; F21S11/00; F21S19/00; F21V; F21V33/00; F21V33/0088; E; E04; E04D; E04D13/00; E04D13/03; E04D2013/034; E04D2013/0345; F21V13/00; F21V13/02; F21V13/04; F21V17/00; F21V17/02; F21V7/00; F21V7/0008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1921-01-21 | 1921-07-23 | 1922-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1925-01-21 | 1925-07-23 | 1926-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1929-01-21 | 1929-07-23 | 1930-01-22 | $7700.00 | Window Closed / Lapsed |