Patent US4017727A successfully refreshed from Google Patents.
US4017727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light projecting apparatus
Assignee: Individual
•
Filing: 1975-11-12
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Granted: 1977-04-12
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Expires: 1995-11-12
Abstract
Abstract An elongated bar having a clamping head thereon is demountably attached to a photo flash unit to position a fresnel lens in the light beam path of the flash unit to project the light beam for telephoto use.
Inventors
- 👤 David J. Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:19
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B2215/00; G03B2215/05; G03B2215/0514; G03B2215/0517; G03B2215/055
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
104 words
A light projecting apparatus comprising: a. a photo flash unit having a light emitting structure from which an elongated body perpendicularly depends; b. an elongated bar one end of which is demountably attached to the elongated body of said photo flash unit, said elongated bar positioned below and extending substantially parallel with the light beam path producable by said photo flash unit; c. a clamping head carried on said elongated bar; and d. a fresnel lens demountably attached to said clamping head and extending therefrom into the light beam path producable by said photo flash unit to substantially coincide with the light beam axis.
Claim 2
Dependent Claim
104 words
A light projecting apparatus comprising: a. a photo flash unit having a light emitting structure from which an elongated body perpendicularly depends; b. an elongated bar one end of which is demountably attached to the elongated body of said photo flash unit, said elongated bar positioned below and extending substantially parallel with the light beam path producable by said photo flash unit; c. a clamping head carried on said elongated bar; and d. a fresnel lens demountably attached to said clamping head and extending therefrom into the light beam path producable by said photo flash unit to substantially coincide with the light beam axis.
Claim 3
Dependent Claim
42 words
A light projecting apparatus as claimed in claim 1 wherein said clamping head is slidably movable along the length of said elongated bar for altering the distance between the said fresnel lens and the light emitting structure of said photo flash unit.
Claim 4
Dependent Claim
56 words
A light projecting apparatus as claimed in claim 1 and further comprising: a. said clamping head slidably movable along the length of said elongated bar; and b. detent means in said clamping head and in said elongated bar for releasably holding said clamping head in at least two positions along the length of said elongated bar.
Claim 5
Dependent Claim
59 words
A light projecting apparatus as claimed in claim 3 wherein said detent means comprises: a. at least two dimples spacedly formed in said elongated bar; and b. a ball mounted in said clamping head, said ball yieldingly biased to move into and out of engagement with said dimples as said clamping head is slidably moved along said elongated bar.
Claim 6
Dependent Claim
72 words
A light projecting apparatus as claimed in claim 3 wherein said detent means comprises: a. a plurality of dimples formed in predetermined spaced increments along the length of said elongated bar; and b. a ball mounted in said clamping head and yieldingly biased to move sequentially into and out of engagement with each of said plurality of dimples when said clamping head is slidably moved along the length of said elongated bar.
Claim 7
Dependent Claim
57 words
A light projecting apparatus as claimed in claim 1 and further comprising: a. said clamping head having a transverse slot formed therein for receiving a portion of one edge of said fresnel lens; and b. means within the transverse slot of said clamping head for releasably holding the portion of the one edge of said fresnel lens.
Claim 8
Dependent Claim
57 words
A light projecting apparatus as claimed in claim 1 wherein said elongated bar is demountably attached to the elongated body of said photo flash unit by a quickly disconnectable clamp means a portion of which is mounted on said elongated bar and another portion of which is mounted on the elongated body of said photo flash unit.
References Cited (Backward Citations)
US2972673A
Cited
US2953675A
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US3404612A
Cited
US3720145A
Cited
US3747488A
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US3878385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |