Patent US4940896A successfully refreshed from Google Patents.
US4940896A
Expired / Lapsed
US
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Pyroelectric calorimeter
Assignee: United States Department of Health and Human Services
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Filing: 1989-02-02
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Granted: 1990-07-10
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Expires: 2009-02-02
Abstract
Abstract A pyroelectric detector comprises a support member having a tapered through-hole therein, a first polyester film positioned on said support member, across said through-hole, an aluminum foil member located on an opposite side of said polyester film from said support member, a pyroelectric film located on an opposite side of said aluminum foil member from said first polyester film, at least one additional polyester film located on an opposite side of said pyroelectric film from said aluminum foil member, and two pyroelectrical leads connected to opposite sides of said pyroelectric film.
Inventors
- 👤 William A. Hagins
- 👤 Shuko Yoshikami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:25
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/20; G01N25/48; G01N25/4806; G01N25/4813; G01N25/482; G01K; G01K17/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
91 words
A pyroelectric detector comprising a support member having a tapered through-hole therein, a first polyester film positioned on said support member, across said through-hole, an aluminum foil member located on an opposite side of said polyester film from said support member, a pyroelectric film located on an opposite side of said aluminum foil member from said first polyester film, at least one additional polyester film located on an opposite side of said pyroelectric film from said aluminum foil member, and two pyroelectrical leads connected to opposite sides of said pyroelectric film.
Claim 2
Dependent Claim
91 words
A pyroelectric detector comprising a support member having a tapered through-hole therein, a first polyester film positioned on said support member, across said through-hole, an aluminum foil member located on an opposite side of said polyester film from said support member, a pyroelectric film located on an opposite side of said aluminum foil member from said first polyester film, at least one additional polyester film located on an opposite side of said pyroelectric film from said aluminum foil member, and two pyroelectrical leads connected to opposite sides of said pyroelectric film.
Claim 3
Dependent Claim
14 words
The pyroelectric detector of claim 1 wherein said pyroelectric film comprises a poly(vinylidene 1,1-difluoride).
Claim 4
Dependent Claim
16 words
The pyroelectric detector of claim 2 wherein said pyroelectric film comprises a poled metal-coated poly(vinylidene 1,1-difluoride).
Claim 5
Dependent Claim
24 words
The pyroelectric detector of claim 3 wherein said metal coating on said poly(vinylidene 1,1-difluoride) is selected from the group consisting of nickel and aluminum.
Claim 6
Dependent Claim
24 words
The pyroelectric detector of claim 1 wherein said at least one additional polyester film include through-holes therein through which said two electrical leads pass.
Claim 7
Dependent Claim
18 words
The pyroelectric detector of claim 5 wherein said at least one additional polyester film comprises two polyester films.
Claim 8
Dependent Claim
35 words
The pyroelectric detector of claim 1 wherein one of said two electrical leads is connected to an area of silver paint located on said first polyester film which silver paint contacts said aluminum foil member.
Claim 9
Dependent Claim
29 words
The pyroelectric detector of claim 1 wherein said polyester films, said aluminum foil member and said pyroelectric film are fixed to their respective adjacent elements by a cyanoacrylate adhesive.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-07-09 | 1994-01-08 | 1994-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-09 | 1998-01-08 | 1998-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-09 | 2002-01-08 | 2002-07-10 | $7700.00 | Window Closed / Lapsed |