US3816844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film washing apparatus
Assignee: Individual
•
Filing: 1969-05-12
•
Granted: 1974-06-11
•
Expires: 1989-05-12
Abstract
Abstract Apparatus for washing film comprising a round tank and a water pipe leading to holes in the base of the tank. The water pipe includes a portion with an opening constructed to draw in air to mix with the water, so that an air-water mixture enters the tank. The holes in the tank are near its perimeter and may be directed tangentially so that the air-water mixture swirls. The water pipe is adapted for connection to a water faucet through a thermometer-holding fixture, from which the thermometer can be readily removed.
Inventors
- 👤 I Pfefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:21
CPC Classifications
G; G03; G03D; G03D3/00; G03D3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
Photographic film washing apparatus comprising: a tank for holding photographic film, said tank having a base surface for generally supporting items to be washed, and a depression in said base surface; a conduit having an outlet positioned near the bottom of said tank and an inlet for connection to a liquid source, said conduit opening into said depression with an orientation to direct a water-air stream against the walls of said depression to slow the stream prior to it rising into the rest of the tank; and means coupled to said conduit between said inlet and outlet for flowing air into said conduit to pass with said water out of said outlet into said tank.
Claim 2
Dependent Claim
115 words
Photographic film washing apparatus comprising: a tank for holding photographic film, said tank having a base surface for generally supporting items to be washed, and a depression in said base surface; a conduit having an outlet positioned near the bottom of said tank and an inlet for connection to a liquid source, said conduit opening into said depression with an orientation to direct a water-air stream against the walls of said depression to slow the stream prior to it rising into the rest of the tank; and means coupled to said conduit between said inlet and outlet for flowing air into said conduit to pass with said water out of said outlet into said tank.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |