US3608454A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imbibition interval timer and annunciator
Assignee: Polaroid Corp
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Filing: 1968-06-27
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Granted: 1971-09-28
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Expires: 1988-06-27
Abstract
Abstract A TIMER-ANNUNCIATOR SYSTEM FOR USE WITH PHOTOGRAPHIC CAMERAS OF THE SELF-DEVELOPING VARIETY. THE DEVICE FUNCTIONS TO ENERGIZE A WARNING LIGHT CONTINUOUSLY DURING THE FILM DEVELOPING-IMBIBITION PROCESS INTERVAL AND TO SOUND AN AUDIBLE ALARM AT THE CONCLUSION OF THE INTERVAL. FOLLOWING THE AUDIBLE ALARM, THE ELECTRONIC CIRCUITRY OF THE SYSTEM IS AUTOMATICALLY DE-ACTIVATED.
Inventors
- 👤 Edwin K Shenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:12
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/48; G03B17/50; G03B17/52; G03D; G03D13/00; G03D13/007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |