Patent US6073218A successfully refreshed from Google Patents.
US4100645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bushing
Assignee: CLEMMER IND 1964 Ltd
•
Filing: 1977-07-15
•
Granted: 1978-07-18
•
Expires: 1997-07-15
Abstract
Abstract A bushing for use with an underground storage tank, consisting of a wall having inner and outer screw threads, the outer thread being a standard taper of 1° 47' and the inner thread being a non-standard taper of between 1° - 48' and 16° - 47'.
Inventors
- 👤 Earl Meyers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:29
CPC Classifications
B; B65; B65D; B65D39/00; B65D39/08; B65D39/082; B65D39/084
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
A bushing for use with an underground storage tank, consisting of a wall having inner and outer screw threads, the outer thread being a standard taper of 1°47' over most of its length, and the inner thread being a non-standard larger taper than the outer thread over most of its length, the outer thread having a taper for the last few threads at its smallest outer diameter of the bushing of a larger angle than the major part of the outer thread.
Claim 2
Dependent Claim
82 words
A bushing for use with an underground storage tank, consisting of a wall having inner and outer screw threads, the outer thread being a standard taper of 1°47' over most of its length, and the inner thread being a non-standard larger taper than the outer thread over most of its length, the outer thread having a taper for the last few threads at its smallest outer diameter of the bushing of a larger angle than the major part of the outer thread.
Claim 3
Dependent Claim
30 words
The bushing of claim 1, wherein the inner thread has an easy entry end at its largest diameter at a larger angle than the major part of the inner thread.
Claim 4
Dependent Claim
19 words
The bushing of claim 1, wherein the material is nylon of a type which expands as it absorbs moisture.
Claim 5
Dependent Claim
19 words
The bushing of claim 1, wherein the inner thread is of an angle between 1° 48' and 16° 47'.
Claim 6
Dependent Claim
16 words
The bushing of claim 4, wherein the inner thread is of an angle of 2° 47'.
Claim 7
Dependent Claim
24 words
The bushing of claim 1, wherein the easy entry angle of the outer thread is of an angle between 1° 48' and 25° 47'.
Claim 8
Dependent Claim
21 words
The bushing of claim 6, wherein the easy entry angle of the outer thread is of an angle of 4° 30'.
Claim 9
Dependent Claim
24 words
The bushing of claim 2, wherein the easy entry end of the inner thread is of an angle between 1° 48' and 25° 47'.
Claim 10
Dependent Claim
21 words
The bushing of claim 8, wherein the easy entry end of the inner thread is of an angle of 5° 47'.
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) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |