Patent US4084180A successfully refreshed from Google Patents.
US4084180A
Expired / Lapsed
US
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Color splitting prism assembly
Assignee: US Philips Corp
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Filing: 1976-10-07
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Granted: 1978-04-11
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Expires: 1996-10-07
Abstract
Abstract A beam splitting prism assembly in which at least some of the prisms are separated by an air gap, optionally connected at the edges through the beam splitting layers by means of strips of a thermo-plastic material.
Inventors
- 👤 Jacobus Stoffels
- 👤 Adrianus Ambosius Johannes Bluekens
- 👤 Maria Peters Petrus Jacobus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:05
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/1006; G02B27/102; G02B27/12; G02B27/126; G02B27/14; G02B27/142; G02B27/145
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
A beam splitting prism assembly comprising a plurality of prisms separated by an air gap, the edges of the prism surfaces bounding the air-gap being provided with a small strip at the glass surfaces, said strip comprising an adhering film of a thermoplastic material located thereon forming a beam splitting layer.
Claim 2
Dependent Claim
51 words
A beam splitting prism assembly comprising a plurality of prisms separated by an air gap, the edges of the prism surfaces bounding the air-gap being provided with a small strip at the glass surfaces, said strip comprising an adhering film of a thermoplastic material located thereon forming a beam splitting layer.
Claim 3
Dependent Claim
15 words
A prism assembly as claimed in claim 1, wherein the thermoplastic material is polyethylene film.
Claim 4
Dependent Claim
14 words
A prism assembly as claimed in claim 2, wherein the film is coloured black.
References Cited (Backward Citations)
GB1206461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-10 | 1981-10-10 | 1982-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-10 | 1985-10-10 | 1986-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-10 | 1989-10-10 | 1990-04-11 | $7700.00 | Window Closed / Lapsed |