Patent US5229435A successfully refreshed from Google Patents.
US4044367A
Expired / Lapsed
US
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Roller blind shutter for cameras
Assignee: Individual
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Filing: 1975-10-14
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Granted: 1977-08-23
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Expires: 1995-10-14
Abstract
Abstract A roller-blind shutter having transverse depressions forming long plateaus in one of a pair of opening and closing shutters which exceed the length of the transverse depressions in the other of the curtains in the region in which they overlap on a spool when the shutter is cocked.
Inventors
- 👤 Lennart Dahlgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:58
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/28; G03B9/32; G03B9/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
A shutter for cameras including, a. an opening curtain and b. a closing curtain, c. a transverse slit formed between said curtains, d. drive means for traversing said curtains and said transverse slit formed therebetween longitudinally of said curtains from a first position to a second position, said drive means including, e. axle means for receiving said closing curtain wound thereon and for receiving a portion of said opening curtain wound at least partially thereon in overlapped relationship with a portion of said closing curtain in said first position, f. said opening curtain and said closing curtain having transverse depressions therein, g. said transverse depressions forming h. planar plateaus and intermediate, i. planar valleys separated by j. transition areas, k. the longitudinal length of the plateaus of one of said curtains being substantially greater than the longitudinal length of the planar valleys of the other of said curtains in the region of overlap of the curtains in said first position.
Claim 2
Dependent Claim
160 words
A shutter for cameras including, a. an opening curtain and b. a closing curtain, c. a transverse slit formed between said curtains, d. drive means for traversing said curtains and said transverse slit formed therebetween longitudinally of said curtains from a first position to a second position, said drive means including, e. axle means for receiving said closing curtain wound thereon and for receiving a portion of said opening curtain wound at least partially thereon in overlapped relationship with a portion of said closing curtain in said first position, f. said opening curtain and said closing curtain having transverse depressions therein, g. said transverse depressions forming h. planar plateaus and intermediate, i. planar valleys separated by j. transition areas, k. the longitudinal length of the plateaus of one of said curtains being substantially greater than the longitudinal length of the planar valleys of the other of said curtains in the region of overlap of the curtains in said first position.
Claim 3
Dependent Claim
20 words
The shutter of claim 1 in which said opening and closing curtains are formed of metal sheets of uniform thickness.
Claim 4
Dependent Claim
26 words
The shutter of claim 1 in which the opening and closing curtains are formed of flexible material and said depressions are formed by thin transverse areas.
Claim 5
Dependent Claim
19 words
The shutter of claim 1 in which the plateaus having the greater length are formed in the opening curtain.
Claim 6
Dependent Claim
26 words
The shutter of claim 4 in which the plateaus having the greater length are substantially greater in length than the remaining plateaus of the opening curtain.
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) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |