US3311070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light table
Assignee: Individual
•
Filing: 1965-11-15
•
Granted: 1967-03-28
•
Expires: 1985-11-15
Abstract
No abstract record available.
Inventors
- 👤 Verl N Barzee
- 👤 Joseph J Harapat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:31
CPC Classifications
A; A47; A47B; A47B27/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A LIGHT TABLE AND DRAFTING BOARD COMPRISING: A RIGID LIGHT TRANSMITTING PLANAR SHEET; A TRANSLUCENT CLOSED CELL PLASTIC FOAM PLANAR SHEET POSITIONED BELOW, CONTIGUOUS TO AND IN FACE TO FACE RELATION WITH SAID RIGID SHEET AND HAVING SUFFICIENT THICKNESS TO SUBSTANTIALLY INSULATE SAID RIGID SHEET FROM THE HEAT OF A LIGHT SOURCE; MEANS POSITIONING SAID SHEETS RELATIVE TO ONE ANOTHER; A LIGHT SOURCE MOUNTED ADJACENT SAID TRANSLUCENT SHEET DIRECTLY LIGHTING SAID RIGID SHEET; AND SAID TRANSLUCENT SHEET DIFFUSING THE RAYS FROM SAID LIGHT SOURCE TO PRESENT A UNIFORM NON GLARE LIGHTING AT THE SURFACE OF SAID RIGID SHEET.
Claim 2
Dependent Claim
98 words
A LIGHT TABLE AND DRAFTING BOARD COMPRISING: A RIGID LIGHT TRANSMITTING PLANAR SHEET; A TRANSLUCENT CLOSED CELL PLASTIC FOAM PLANAR SHEET POSITIONED BELOW, CONTIGUOUS TO AND IN FACE TO FACE RELATION WITH SAID RIGID SHEET AND HAVING SUFFICIENT THICKNESS TO SUBSTANTIALLY INSULATE SAID RIGID SHEET FROM THE HEAT OF A LIGHT SOURCE; MEANS POSITIONING SAID SHEETS RELATIVE TO ONE ANOTHER; A LIGHT SOURCE MOUNTED ADJACENT SAID TRANSLUCENT SHEET DIRECTLY LIGHTING SAID RIGID SHEET; AND SAID TRANSLUCENT SHEET DIFFUSING THE RAYS FROM SAID LIGHT SOURCE TO PRESENT A UNIFORM NON GLARE LIGHTING AT THE SURFACE OF SAID RIGID SHEET.
References Cited (Backward Citations)
US1018607A
Cited
US1676440A
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US1846878A
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US1887288A
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US2350340A
Cited
US2430862A
Cited
FR1096603A
Cited
US3032917A
Cited
US3104492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |