Patent US4248546A successfully refreshed from Google Patents.
US4248546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manhole ceiling tent
Assignee: Sanwa Business Credit Corp
•
Filing: 1979-06-27
•
Granted: 1981-02-03
•
Expires: 1999-06-27
Abstract
Abstract A manhole tent including a substantially planar sheet-like portion for placement in contiguous relationship to the ceiling of a manhole, an opening in the sheet-like portion, a chimney attached to the sheet-like portion and leading to the opening for permitting ingress and egress of personnel into a manhole, and grommets in the edges of the sheet-like portion for receiving ties for securing the manhole tent in position.
Inventors
- 👤 Donald J. Danner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:55
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
35 words
A manhole tent comprising sheet-like means for placement in contiguous relationship to the ceiling of a manhole, and opening means in said sheet-like means for permitting ingress and egress of personnel relative to said manhole.
Claim 2
Dependent Claim
35 words
A manhole tent comprising sheet-like means for placement in contiguous relationship to the ceiling of a manhole, and opening means in said sheet-like means for permitting ingress and egress of personnel relative to said manhole.
Claim 3
Dependent Claim
24 words
A manhole tent as set forth in claim 1 including attachment means for suspending said manhole tent in said contiguous relationship to said ceiling.
Claim 4
Dependent Claim
23 words
A manhole tent as set forth in claim 2 including a tent chimney attached to said sheet-like means leading to said opening means.
Claim 5
Dependent Claim
22 words
A manhole tent as set forth in claim 3 including second attachment means for attaching said tent chimney within a manhole chimney.
Claim 6
Dependent Claim
48 words
A manhole tent as set forth in claim 4 wherein said attachment means comprises a plurality of grommets at the edges of said sheet-like means and wherein said second attachment means comprises a plurality of grommets at the edge of said tent chimney remote from said sheet-like means.
Claim 7
Dependent Claim
19 words
A manhole tent as set forth in claim 4 wherein said attachment means comprises a plurality of tie members.
Claim 8
Dependent Claim
24 words
A manhole tent as set forth in claim 3 wherein said tent chimney includes a chimney extension for varying the length of said chimney.
Claim 9
Dependent Claim
106 words
A manhole tent as set forth in claim 7 wherein said tent chimney includes first attachment means at the outer end thereof remote from said sheet-like means for securing said tent chimney relative to a manhole chimney, securing means for securing said tent chimney extension proximate said outer end of said tent chimney to permit said chimney extension to lie in contiguous relationship to said tent chimney but to be moved into an extending relationship with respect thereto, and second attachment means on the end of said tent chimney extension remote from said securing means for securing said tent chimney extension relative to a manhole chimney.
Claim 10
Dependent Claim
32 words
A manhole tent as set forth in claim 2 wherein said attachment means includes a rod, and mounting means on said rod for mounting said rod proximate said ceiling of said manhole.
Claim 11
Dependent Claim
15 words
A manhole tent as set forth in claim 9 including means for expanding said rod.
Claim 12
Dependent Claim
30 words
A manhole tent as set forth in claim 10 wherein said mounting means comprise securing means on the ends of said rod for securement on opposite walls of said manhole.
Claim 13
Dependent Claim
19 words
A manhole tent as set forth in claim 11 wherein said securing means comprise pointed ends on said rod.
References Cited (Backward Citations)
US3009166A
Cited
US3048183A
Cited
US3489156A
Cited
US3581436A
Cited
US3712009A
Cited
US3865429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |