I'm having the same issue on Ubuntu 14.04.1 LTS.

# minor rev difference in back end;
# no entries specific to 03f0:0701 in either 40-libsane.rules file, but there 
were 2 scanners 
# present in ubuntu 12.04 file which are missing from ubuntu 14.04 file:
diff /lib/udev/rules.d/40-libsane.rules 
/ub12_64/lib/udev/rules.d/40-libsane.rules
2c2
< # by sane-desc 3.5 from sane-backends 1.0.23
---
> # by sane-desc 3.5 from sane-backends 1.0.22
...
90,91d89
< # Hewlett-Packard ScanJet 4850C
< ATTRS{idVendor}=="03f0", ATTRS{idProduct}=="1b05", ENV{libsane_matched}="yes"
120,121d117
< # Hewlett-Packard ScanJet N6310
< ATTRS{idVendor}=="03f0", ATTRS{idProduct}=="4705", ENV{libsane_matched}="yes"
...

# shows up in lsusb:
> lsusb
...
Bus 005 Device 006: ID 03f0:0701 Hewlett-Packard ScanJet 5300c/5370c
...

# scanner shows as "busy" in avision debug log (2 repeats of pattern below):
> export SANE_DEBUG_AVISION=7
> scanimage -L
[sanei_debug] Setting debug level of avision to 7.
[avision] sane_init:(Version: 1.0 Build: 296)
...
[avision] sane_reload_devices: config file line 26: trying to attach USB:`usb 
0x03f0 0x0701'
[avision] attach:
[avision] attach: opening libusb:005:006
[avision] attach: open failed (Device busy)
...
[avision] sane_reload_devices: Trying to find USB device 03f0 0701 ...
[avision] attach:
[avision] attach: opening libusb:005:006
[avision] attach: open failed (Device busy)
[avision] sane_reload_devices: Trying to find USB device 03f0 0701 ...
[avision] attach:
[avision] attach: opening libusb:005:006
[avision] attach: open failed (Device busy)

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Packages, which is subscribed to sane-backends in Ubuntu.
https://bugs.launchpad.net/bugs/1080787

Title:
  hp scanner 5300c does no longer work after upgrading to quantal

Status in “sane-backends” package in Ubuntu:
  Confirmed

Bug description:
  on 12.10 the scanner doesn't work anymore.
  on 12.04 it worked on the same machine.
  the scanner still works on a second machine that was not upgraded by now.

  
  uname:
  Linux matrix 3.5.0-17-generic #28-Ubuntu SMP Tue Oct 9 19:31:23 UTC 2012 
x86_64 x86_64 x86_64 GNU/Linux

  lsb_release:
  Description:  Ubuntu 12.10
  Release:      12.10

  versions:
  sane: 1.0.14-9
  libsane: 1.0.23-0ubuntu1

  dmesg:
  [12883.928037] usb 3-6: >new full-speed USB device number 23 using ohci_hcd
  [12884.157054] usb 3-6: >New USB device found, idVendor=03f0, idProduct=0701
  [12884.157059] usb 3-6: >New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
  [12884.157062] usb 3-6: >Product: Hewlett Packard ScanJet 5300C/5370C 
  [12884.157064] usb 3-6: >Manufacturer: Hewlett Packard
  [12884.157067] usb 3-6: >SerialNumber: 0000000000000000

  lsusb:
  Bus 003 Device 002: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth 
Dongle (HCI mode)
  Bus 003 Device 023: ID 03f0:0701 Hewlett-Packard ScanJet 5300c/5370c
  Bus 004 Device 002: ID 08e6:3437 Gemplus GemPC Twin SmartCard Reader
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

  scanimage -Lv
  No scanners were identified. If you were expecting something different,
  check that the scanner is plugged in, turned on and detected by the
  sane-find-scanner tool (if appropriate). Please read the documentation
  which came with this software (README, FAQ, manpages).

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