US4510419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grip-type photographic flash discharge device
Assignee: Fuji Koeki Corp
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Filing: 1983-06-17
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Granted: 1985-04-09
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Expires: 2003-06-17
Abstract
Abstract A photographic flash device comprising a grip portion and a flash unit removably attachable thereto. Both the grip portion and flash unit house battery-powered DC-DC converters which cooperate upon attachment of the flash unit to the grip portion in charging a main discharge capacitor. A source switch permits charging of the discharge capacitor by only one of the DC-DC converters, and a safety switch prevents operation of at least one of the converters when the flash unit is not attached to the grip portion.
Inventors
- 👤 Yoshiyuki Takematsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:02
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/05; G03B2215/00; G03B2215/05; G03B2215/0514; G03B2215/056
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
121 words
A grip portion type photographic flash discharge device, comprising: a. a main discharge capacitor for storing charge with which to effect discharge of said flash device; b. a grip portion provided with a first DC-DC converter and adapted to receive a first battery power source for activating said first DC-DC converter; c. a flash unit provided with a second DC-DC converter and adapted to receive a second battery source for activating said second DC-DC converter, said flash unit being removably attachable to said grip portion; and d. electrical interconnection means for connecting said first and second DC-DC converters by attachment of said flash unit to said grip portion, said main discharge capacitor being chargeable by the cooperation of said connected converters.
Claim 2
Dependent Claim
121 words
A grip portion type photographic flash discharge device, comprising: a. a main discharge capacitor for storing charge with which to effect discharge of said flash device; b. a grip portion provided with a first DC-DC converter and adapted to receive a first battery power source for activating said first DC-DC converter; c. a flash unit provided with a second DC-DC converter and adapted to receive a second battery source for activating said second DC-DC converter, said flash unit being removably attachable to said grip portion; and d. electrical interconnection means for connecting said first and second DC-DC converters by attachment of said flash unit to said grip portion, said main discharge capacitor being chargeable by the cooperation of said connected converters.
Claim 3
Dependent Claim
56 words
A flash discharge device as recited in claim 1, wherein said electrical interconnection means comprises connecting terminals located on said flash unit and on said grip portion, said terminals on said flash unit cooperating with said terminals on said grip portion to establish electrical contact therebetween upon attachment of such flash unit to said grip portion.
Claim 4
Dependent Claim
48 words
A photographic flash discharge device as recited in claim 2, wherein said main discharge capacitor is located in said flash unit and said grip portion includes a safety switch for preventing operation of said first DC-DC converter whenever said flash unit is not attached to said grip portion.
Claim 5
Dependent Claim
61 words
A photographic flash discharge device as recited in claim 1, further including a source switch for disconnecting one of said first or second battery power sources from a corresponding one of said first and second DC-DC converters for charging of said main discharge capacitor exclusively by the other of said DC-DC converters with said flash unit attached to said grip portion.
References Cited (Backward Citations)
US2740339A
Cited
US2738443A
Cited
US3134547A
Cited
US3334270A
Cited
US3858087A
Cited
US4468592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |