US3567319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illumination system
Assignee: International Business Machines Corp
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Filing: 1968-10-09
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Granted: 1971-03-02
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Expires: 1988-10-09
Abstract
Abstract AN ILLUMINATION SYSTEM FOR CONVERTING DIVERGING LIGHT FROM A LIGHT SOURCE INTO CONVERGING LIGHT WITHOUT THE USE OF A LENS, BY UTILIZING A HALF-SILVERED MIRROR AND TWO RETROREFLECTIVE SURFACES.
Inventors
- 👤 Charles A Gaston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:36
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/20; G03B21/2066; G02; G02B; G02B19/00; G02B19/0004; G02B19/0028; G02B27/00; G02B27/10; G02B27/14; G02B27/18; G03B21/001; G03B27/00; G03B27/32; G03B27/52; G03B27/54; G03B27/545
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |