US3626447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable air inflated drydock
Assignee: Individual
•
Filing: 1969-10-22
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Granted: 1971-12-07
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Expires: 1989-10-22
Abstract
Abstract A portable drydock for larger boats and small ships comprising a chock equipped platform and inflatable pontoons attached to the underside thereof. The platform is retained in all horizontal directions and guided in its upward and downward movements by an upright guide rail at each corner thereof which has a pedestal of concrete resting on the bottom of the body of water in which the drydock is located and which rail extends above the water being surmounted by a marker. The boat or ship is maneuvered between the markers at each side of the platform and the pontoons are inflated to float the platform and raise the vessel from the water on the chocks.
Inventors
- 👤 Harry O Hindlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:35
CPC Classifications
B; B63; B63C; B63C1/00; B63C1/02; B63C1/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
181 words
A portable drydock for use in a body of water which comprises: a platform adapted to receive a load; inflatable means suspended from the underside of said platform for raising and lowering the same in the water, the inflatable means having sufficient capacity to raise the loaded platform to the surface of the water; at least four substantially upright members each having an enlarged lower portion adapted to be supported on the bottom of the water body, one of the upright members being positioned substantially at each corner of the platform with the upper portion of each extending above the surface of the water body, the upright members being stationary with respect to the bottom of the water body upon inflation of the inflatable means; and a plurality of restraining means equal in number to the number of upright members, each of the restraining means being rigidly attached to said platform and encircling a different one of the upright members for restraining the platform in all horizontal directions while allowing vertical platform movement upon inflation and deflation of the inflatable means.
Claim 2
Dependent Claim
181 words
A portable drydock for use in a body of water which comprises: a platform adapted to receive a load; inflatable means suspended from the underside of said platform for raising and lowering the same in the water, the inflatable means having sufficient capacity to raise the loaded platform to the surface of the water; at least four substantially upright members each having an enlarged lower portion adapted to be supported on the bottom of the water body, one of the upright members being positioned substantially at each corner of the platform with the upper portion of each extending above the surface of the water body, the upright members being stationary with respect to the bottom of the water body upon inflation of the inflatable means; and a plurality of restraining means equal in number to the number of upright members, each of the restraining means being rigidly attached to said platform and encircling a different one of the upright members for restraining the platform in all horizontal directions while allowing vertical platform movement upon inflation and deflation of the inflatable means.
Claim 3
Dependent Claim
46 words
The drydock of claim 1 wherein the upright members comprise a length of structural I-beam and the restraining means comprise a collar which extends around the upright member and supports a pair of rollers positioned to ride in the web portion of the I-beam upright members.
Claim 4
Dependent Claim
18 words
The subject matter of claim 1 in which the platform is made up of sections removably attached together.
Claim 5
Dependent Claim
29 words
The subject matter of claim 1 in which the platform is of open work construction to permit easy passage of water therethrough during raising and lowering of the platform.
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |