US4575233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic printing
Assignee: Western Litho Plate and Supply Co
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Filing: 1985-03-11
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Granted: 1986-03-11
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Expires: 2005-03-11
Abstract
Abstract An apparatus for exposing boards which are photosensitive on both sides, for production of printed circuits on both sides, to light through films on both sides in which a lower film, a board, and an upper film in registered position on a light-transmitting platen are pressed down by a window and exposed to light on both sides through the platen and window. A pair of registration pins are adjustably positioned in spaced relation along an edge of the platen and corresponding holes in the boards are used to align the boards and films for exposure. The pins are spaced as widely apart as possible to provide maximum registration between boards of varying sizes and films.
Inventors
- 👤 Harry J. Copeland
- 👤 John W. Powers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:06
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/14; G03B27/18; G03B27/20; G03B27/04; H; H05; H05K; H05K3/00; H05K3/0073; H05K3/0082
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
173 words
Apparatus for exposing boards which are photosensitized on both sides, for production of printed circuits on both sides, to light through films on both sides, each film being imaged in a circuit pattern, said apparatus comprising: an exposure station at which a board is exposed to light through films on both sides, a light-transmitting platen at the exposure station for holding thereon a lower film, a board on the lower film and an upper film on the board, registration means being variably positionable at the exposure station adjacent the platen for holding any one of a variety of sizes of boards along an edge thereof in registry with the upper and lower films during exposure, and a window movable from a raised position above the platen to a lowered position for engagement of the lower face of the window with the upper film for pressing the upper film, the board and the lower film together against the platen, means for exposing the board at the exposure station to light through the two films.
Claim 2
Dependent Claim
173 words
Apparatus for exposing boards which are photosensitized on both sides, for production of printed circuits on both sides, to light through films on both sides, each film being imaged in a circuit pattern, said apparatus comprising: an exposure station at which a board is exposed to light through films on both sides, a light-transmitting platen at the exposure station for holding thereon a lower film, a board on the lower film and an upper film on the board, registration means being variably positionable at the exposure station adjacent the platen for holding any one of a variety of sizes of boards along an edge thereof in registry with the upper and lower films during exposure, and a window movable from a raised position above the platen to a lowered position for engagement of the lower face of the window with the upper film for pressing the upper film, the board and the lower film together against the platen, means for exposing the board at the exposure station to light through the two films.
Claim 3
Dependent Claim
37 words
Apparatus as defined in claim 1 wherein the registration means includes a pair of registration pins adjustably disposable in fixed positions along an edge of the platen and the adjacent edge of the board to be exposed.
Claim 4
Dependent Claim
48 words
Apparatus as defined in claim 2 wherein the pins are positionable in spaced relation such that they fit in corresponding holes in the boards which are closely adjacent the ends of the board along the edge of the platen adjacent which they are positioned in the exposure station.
Claim 5
Dependent Claim
22 words
Apparatus as defined in claim 3 including: means defined in the platen for receiving and holding the registration pins in predetermined positions.
Claim 6
Dependent Claim
92 words
Apparatus as defined in claim 1 including: a loading magazine disposed adjacent the exposure station, means on said magazine for holding a stack of boards for individual delivery to the exposure station; said window having means associated therewith for holding said upper film on its lower face, means operable with the window raised and holding the upper film for delivering a board from the stack to the exposure station and applying it to a lower film on said platen in engagement with the registration means so that the board is in registry.
Claim 7
Dependent Claim
31 words
Apparatus as defined in claim 5 including further registration means disposed at the loading magazine for aligning the boards so that they are juxtaposed with their position in the exposure station.
Claim 8
Dependent Claim
34 words
Apparatus as defined in claim 6 including loading pins at the magazine for holding the stack of boards with corresponding holes therein along the same edge thereof as the holes for the registration pins.
Claim 9
Dependent Claim
25 words
Apparatus as defined in claim 7 wherein the loading pins are spaced the same as or lesser distance than the spacing of the registration pins.
Claim 10
Dependent Claim
92 words
Apparatus as defined in claim 2 including: a loading magazine disposed adjacent the exposure station, means on said magazine for holding a stack of boards for individual delivery to the exposure station; said window having means associated therewith for holding said upper film on its lower face, means operable with the window raised and holding the upper film for delivering a board from the stack to the exposure station and applying it to a lower film on said platen in engagement with the registration means so that the board is in registry.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |