Patent US1463797A successfully refreshed from Google Patents.
US1463797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical telegraphy
Assignee: Individual
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Filing: 1920-07-09
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Granted: 1923-08-07
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Expires: 1940-07-09
Abstract
Abstract 146,138. Charbonneau, L. A. Feb. 11, 1918, [Convention date]. Void [Published under Sect. 91 of the Act]. Drawings to Specification. Production of metal.-A screen which is opaque to visible rays but transmits the infra-red, may consist of black glass composed of silica, alumina, manganese mon-oxide, lime, magnesia, soda, and iron sesqui-oxide in stated proportions.
Inventors
- 👤 Charbonneau Leon Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:21
CPC Classifications
F; F21; F21V; F21V17/00; F21V17/02; H; H04; H04B; H04B10/00; H04B10/11
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) | 1926-08-06 | 1927-02-05 | 1927-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-08-06 | 1931-02-05 | 1931-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-08-06 | 1935-02-05 | 1935-08-07 | $7700.00 | Window Closed / Lapsed |