US3215036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide projector with shiftable filters
Assignee: Individual
•
Filing: 1962-02-15
•
Granted: 1965-11-02
•
Expires: 1982-02-15
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Kirkconnell
- 👤 Charles D Tolson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:06
CPC Classifications
G; G03; G03B; G03B33/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
A PROJECTION SYSTEM COMPRISING: A PROJECTOR FOR OPTICALLY PROJECTION IMAGES FROM SLIDES AND INCLUDING A SLIDE CHANGER; FILTERING MEANS ON SAID PROJECTOR AND INCLUDING A FILTER AND A FILTER CHANGER, FOR FILTERING LIGHT PROJECTED FROM SAID PROJECTORS; A FILTER OPERATED SWITCH IN SAID FILTERING MEANS, SAID SWITCH BEING COUPLED TO A SOURCE OF ELECTRICAL ENERGY AND OPERABLE BY SAID FILTER IN A SELECTED POSITION OF SAID FILTER; A TIMER CIRCUIT COUPLED TO SAID SWITCH FOR ENERGIZATION OF SAID CIRCUIT BY CLOSURE OF SAID SWICH BY SAID FILTER UPON MOVEMENT OF SAID FILTER TO ONE POSITION, SAID TIMER CIRCUIT INCLUDING A FIRST TIMER OPERATED SWITCH COUPLED TO SAID SOURCE AND CLOSABLE BY SAID CIRCUIT
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |